UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  SCHEDULE 13D

                    UNDER THE SECURITIES EXCHANGE ACT OF 1934



                                Telos Corporation
--------------------------------------------------------------------------------
                                (Name of Issuer)


             12% Cumulative Exchangeable Redeemable Preferred Stock,
                           $0.01 par value per share
--------------------------------------------------------------------------------
                         (Title of Class of Securities)


                                    8796B200
         --------------------------------------------------------------
                                 (CUSIP Number)


                        Grand Slam Asset Management, LLC
                              2200 Fletcher Avenue
                           Fort Lee, New Jersey 07024
                                 (201) 346-4335
                               Attn: Erik Volfing


--------------------------------------------------------------------------------
       (Name, Address and Telephone Number of Person Authorized to Receive
                          Notices and Communications)


                                February 7, 2007
         --------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)


If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  which is the subject of this  Schedule 13D, and is filing this
schedule because of ss.ss.240.13d-1(e),  240.13d-1(f) or 240.13d-1(g), check the
following box. |_|

Note:  Schedules  filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. See Rule 13d-7 for other parties
to whom copies are to be sent.

*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for  any  subsequent   amendment   containing   information  which  would  alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).


                                                                SEC 1746 (12-91)




CUSIP NO. 8796B200                                              SCHEDULE 13D
--------------------------------------------------------------------------------
1       NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

        Grand Slam Asset Management, LLC            IRS # 22-3779105

--------------------------------------------------------------------------------
2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
         (a) |X| Joint Filing
         (b)

--------------------------------------------------------------------------------
3       SEC USE ONLY

--------------------------------------------------------------------------------
4       SOURCE OF FUNDS*

        AF
--------------------------------------------------------------------------------
5       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS RE-
        QUIRED PURSUANT TO ITEM 2(d) OR 2(e)    |_|
--------------------------------------------------------------------------------
6       CITIZENSHIP OR PLACE OF ORGANIZATION

        Delaware, USA
--------------------------------------------------------------------------------
                        7      SOLE VOTING POWER

                               -0-

       NUMBER OF        --------------------------------------------------------
        SHARES          8      SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY                164,477
         EACH           --------------------------------------------------------
      REPORTING         9      SOLE DISPOSITIVE POWER
        PERSON
         WITH                  -0-
                        --------------------------------------------------------
                        10     SHARED DISPOSITIVE POWER

                               164,477
--------------------------------------------------------------------------------
11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          164,477
--------------------------------------------------------------------------------
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
          CERTAIN SHARES*                                                  |_|


--------------------------------------------------------------------------------
13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

          5.16%
--------------------------------------------------------------------------------
14        TYPE OF REPORTING PERSON

           IA
--------------------------------------------------------------------------------



                                     Page 2


CUSIP NO. 987824109                                             SCHEDULE 13D
--------------------------------------------------------------------------------
1       NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

        Grand Slam Capital Master Fund, Ltd.           IRS # 20-0239056

--------------------------------------------------------------------------------
2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*              (a) |X|
                                                                       (b)

--------------------------------------------------------------------------------
3       SEC USE ONLY

--------------------------------------------------------------------------------
4       SOURCE OF FUNDS*

        WC
--------------------------------------------------------------------------------
5       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS RE-
        QUIRED PURSUANT TO ITEM 2(D) OR 2(E)    |_|

--------------------------------------------------------------------------------
6       CITIZENSHIP OR PLACE OF ORGANIZATION

        Cayman Islands
--------------------------------------------------------------------------------
                        7      SOLE VOTING POWER

                               -0-

       NUMBER OF        --------------------------------------------------------
        SHARES          8      SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY                164,477
         EACH           --------------------------------------------------------
      REPORTING         9      SOLE DISPOSITIVE POWER
        PERSON
         WITH                  -0-
                        --------------------------------------------------------
                        10     SHARED DISPOSITIVE POWER

                               164,477
--------------------------------------------------------------------------------
11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          164,477
--------------------------------------------------------------------------------
12        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
          CERTAIN SHARES*


--------------------------------------------------------------------------------
13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

          5.16%
--------------------------------------------------------------------------------
14        TYPE OF REPORTING PERSON

           OO
--------------------------------------------------------------------------------



                                     Page 3




         ITEM 1.  SECURITY AND ISSUER

The title of the class of equity  securities to which this statement on Schedule
13D (the  "Statement")  relates is the 12%  Cumulative  Exchangeable  Redeemable
Preferred  Stock,  par value $0.01 per share (the "Preferred  Stock"),  of Telos
Corporation,  a Maryland corporation (the "Issuer"), and is being filed with the
Securities and Exchange  Commission (the "SEC") pursuant to Rule 13d-1 under the
Securities  Exchange Act of 1934, as amended (the "Exchange Act"). The principal
offices of the  Issuer are  located at 19886  Ashburn  Road,  Ashburn,  Virginia
20147-2358.

         ITEM 2.  IDENTITY AND BACKGROUND

         (a) This  Statement is being filed by Grand Slam  Capital  Master Fund,
Ltd., a Cayman Islands exempted company ("Master Fund").  Master Fund was formed
for the purpose of acquiring and managing  assets.  This Statement is also being
filed by Grand Slam Asset Management,  LLC, a Delaware limited liability company
("Asset Management", together with Master Fund, the "Reporting Parties), for and
on behalf of itself,  which serves as the investment  advisor of Master Fund. As
such, Asset Management may be deemed to control, directly or indirectly,  Master
Fund and to  beneficially  own the shares of Preferred  Stock being  reported on
this Statement by Master Fund.

         (b) The address of the principal  offices of Asset  Management  and the
mailing  address of Master Fund is 2200  Fletcher  Avenue,  Fort Lee, New Jersey
07024.  The address of the  principal  offices of Master Fund is c/o Walkers SPV
Limited,  Walker House, 87 Mary Street, Walker House, George Town, Grand Cayman,
KY-9002, Cayman Islands, B.W.I.

         (c)  Attached as Exhibit A is the name of the  executive  officers  and
managers  of  Asset  Management  and  their  business  addresses  and  principal
occupations.  Attached  as  Exhibit B are the names of the  directors  of Master
Fund,  their business  addresses and principal  occupations.  Master Fund has no
executive officers.

         (d)  During the last five years,  neither of the Reporting  Parties nor
any person listed on Exhibits A or B has been convicted in a criminal proceeding
(excluding traffic violations or similar misdemeanors).

         (e) During the last five years,  neither of the  Reporting  Parties nor
any person listed on Exhibits A or B has been a party to a civil proceeding of a
judicial or  administrative  body of competent  jurisdiction  and as a result of
such proceeding was or is subject to a judgment, decree or final order enjoining
future violations of, or prohibiting or mandating


                                     Page 4


activities subject to, federal or state securities laws or finding any violation
with respect to such laws.

         (f) The  nationality  of the  executive  officers and managers of Asset
Management  are set forth on  Exhibit A. The  nationality  of the  directors  of
Master Fund are set forth on Exhibit B.


         ITEM 3.  SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION

The funds for the purchase of the shares of Preferred Stock set forth on Exhibit
C hereto (the "Shares")  have come from the working  capital of Master Fund. The
aggregate  amount of funds  used in making  the  purchases  of the Shares in the
sixty  days  prior  to the date  upon  which  the  Reporting  Parties  reporting
requirement arose is $1,979,869.01.


         ITEM 4.  PURPOSE OF TRANSACTION

         The Reporting  Parties have  acquired the Shares,  as described in this
Statement,  in order to obtain a substantial equity position in the Issuer based
on the  Reporting  Parties'  belief that the Preferred  Stock at current  market
prices is  undervalued  and  represent  an  attractive  investment  opportunity.
Depending  upon  overall  market  conditions,   other  investment  opportunities
available to the Reporting Parties,  and the availability of shares of Preferred
Stock at prices that would make the purchase of additional shares desirable, the
Reporting Parties may endeavor to increase their position in the Issuer through,
among other things, the purchase of shares of Preferred Stock on the open market
or in private transactions or otherwise,  on such terms and at such times as the
Reporting  Parties may deem advisable.  Asset Management  anticipates that, from
time to time,  it may  communicate  with the Issuer  regarding  its business and
strategic  opportunities and identify to the Issuer strategic  opportunities and
alternatives to be considered by the Issuer.  Asset Management may also propose,
propose to arrange, or identify to the Issuer sources of capital.

         Other than as set forth herein,  neither of the Reporting Parties,  nor
any of the  individuals  set forth on Exhibits A or B has any plans or proposals
that relate to or would result in any of the following:

         (a) The  acquisition  of additional  securities  of the Issuer,  or the
disposition of securities of the Issuer;

         (b)  An  extraordinary   corporate  transaction,   such  as  a  merger,
reorganization or liquidation, involving the Issuer;

         (c) A sale or transfer of a material amount of assets of the Issuer;



                                     Page 5


              (d) Any change in the present  board of directors or management of
the Issuer,  including  any plans or  proposals  to change the number or term of
directors or to fill any existing vacancies on the board;

              (e) Any material change in the present  capitalization or dividend
policy of the Issuer;

              (f)  Any  other  material  change  in  the  Issuer's  business  or
corporate structure;

              (g) Any other material changes in the Issuer's charter, by-laws or
instruments  corresponding  thereto  or  other  actions  which  may  impede  the
acquisition of control of the Issuer by any person;

              (h)  Causing a class of  securities  of the Issuer to be  delisted
from a national  securities exchange or ceasing to be authorized to be quoted on
an  inter-dealer   quotation   system  of  a  registered   national   securities
association;

              (i) A class of equity  securities of the Issuer becoming  eligible
for  termination of  registration  pursuant to Section  12(g)(4) of the Exchange
Act; or

              (j) Any action similar to those enumerated above.


         ITEM 5.  INTEREST IN SECURITIES OF THE ISSUER

         (a) The  Reporting  Parties  beneficially  own an  aggregate  of Shares
representing  approximately  5.16%  of the  issued  and  outstanding  shares  of
Preferred Stock of the Issuer. The percentage ownership of the Reporting Parties
in the  Issuer's  capital  stock is based on  3,185,586  issued and  outstanding
shares of the Preferred Stock as reported by the Issuer in its Quarterly  Report
on Form 10-Q for the quarter ended  September 30, 2006,  filed with the SEC. The
managers of Asset  Management  do not  beneficially  own any shares of Preferred
Stock. Since Asset Management may be deemed to control,  directly or indirectly,
Master Fund, Asset Management may be deemed to have the power to direct the vote
or disposition of the Shares,  and accordingly,  may be deemed,  for purposes of
determining  beneficial ownership pursuant to Rule 13d-3 under the Exchange Act,
to beneficially own the Shares held by Master Fund.

         (b) Master Fund  directly  owns the Shares and has the power to vote or
direct the vote and to dispose or direct the  disposition  of the Shares.  Asset
Management may be deemed to control, directly or indirectly,  Master Fund, Asset
Management  may be deemed to have  shared  power to vote or direct  the vote and
dispose or direct the disposition of the Shares and may be deemed,  for purposes
of determining  beneficial  ownership  pursuant to Rule 13d-3 under the Exchange
Act, to beneficially own the shares of Preferred Stock held by Master Fund.

         (c) The dates and amount of each acquisition of the Shares is listed on
Exhibit C hereto.  Except as set forth in  Exhibit C hereto,  there have been no
transactions  in shares of



                                     Page 6


Preferred  Stock since the date of the filing of this Statement by the Reporting
Parties or any person or entity listed on Exhibits A or B hereto.

         (d) No  person is known to have the  right to  receive  or the power to
direct the  receipt of  dividends  from,  or the  proceeds  from the sale of the
Shares owned by Master Fund except Asset Management.

         (e) Not applicable.

         ITEM 6.  CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH
                  RESPECT TO SECURITIES OF THE ISSUER

Asset Management provides investment management services to Master Fund pursuant
to that certain  Amended and Restated  Investment  Management  Agreement,  dated
September  1, 2003,  by and among Asset  Management,  Master Fund and Grand Slam
Capital Offshore Fund, Ltd.








                                     Page 7





         ITEM 7.  MATERIAL TO BE FILED AS EXHIBITS

         The following materials are filed as Exhibits to the Statement:


         EXHIBIT A:     Information with respect to the executive officers
                        and managers of Grand Slam Asset Management, LLC.

         EXHIBIT B:     Information  with respect to the directors of Grand Slam
                        Capital Master Fund, Ltd.

         EXHIBIT C:     As described in Item 3.

         EXHIBIT D:     Joint Filing Agreement.







                                     Page 8




                                    SIGNATURE



         After reasonable  inquiry and to the best of my knowledge and belief, I
certify that the information  set forth in this Statement is true,  complete and
correct.



Dated: February 14, 2007                 Grand Slam Capital Master Fund, Ltd.




                                         By: /s/ Mitchell Sacks
                                         ---------------------------------------
                                         Name: Mitchell Sacks
                                         Title: Director


Dated: February 14, 2007                 Grand Slam Asset Management, LLC




                                         By: /s/ Mitchell Sacks
                                         ---------------------------------------
                                         Name: Mitchell Sacks
                                         Title: Member





                                     Page 9



                                                                       EXHIBIT A



             INFORMATION WITH RESPECT TO THE EXECUTIVE OFFICERS AND
                  MANAGERS OF GRAND SLAM ASSET MANAGEMENT, LLC





NAME AND ADDRESS        POSITION WITH GRAND SLAM        PRINCIPAL OCCUPATION           CITIZENSHIP
                        ASSET MANAGEMENT, LLC

                                                                              
Mitchell Sacks(1)       Member, Managing Member,        Managing Grand Slam Asset      USA
                        Chief Executive Officer and     Management, LLC and Grand
                        Portfolio Manager               Slam General Partners, LLC

Erik Volfing(1)         Member, Chief Financial         Managing Grand Slam Asset      Denmark
                        Officer and Portfolio Manager   Management, LLC and Grand
                                                        Slam General Partners, LLC

Michael Legg(1)         Member, Chief Compliance        Managing Grand Slam Asset      USA
                        Officer and Portfolio Manager   Management, LLC and Grand
                                                        Slam General Partners, LLC



1. The business address of each of the named individuals is c/o Grand Slam
General Partners, LLC, 2200 Fletcher Avenue, Fort Lee, New Jersey 07024.




                                    Page 10



                                                                       EXHIBIT B

  INFORMATION WITH RESPECT TO DIRECTORS OF GRAND SLAM CAPITAL MASTER FUND, LTD.





NAME AND ADDRESS             POSITION WITH GRAND SLAM          PRINCIPAL OCCUPATION           CITIZENSHIP
                             CAPITAL MASTER, LTD.
                                                                                     
Mitchell Sacks(1)            Director                          Managing Grand Slam Asset      USA
                                                               Management, LLC and Grand
                                                               Slam General Partners

Martin Lang(2)               Director                          Employed by International      Cayman Islands
                                                               Management Services

Ian Goodall(2)               Director                          Employed by International      Cayman Islands
                                                               Management Services



1. The business address of Mitchell Sacks is c/o Grand Slam General Partners,
LLC, 2200 Fletcher Avenue, Fort Lee, New Jersey 07024.

2. The business address of the named individuals is c/o International Management
Services Limited, 4th Floor, Harbour Centre, George Town, Cayman Islands.



                                    Page 11



                                                                       EXHIBIT C

                            SCHEDULE OF TRANSACTIONS
                                       BY
                          GRAND SLAM MASTER FUND, LTD.

            DATE OF PUCHASE          NUMBER OF SHARES OF        PRICE PER SHARE
                                       PREFERRED STOCK                ($)
                                          PURCHASED
================================================================================

              12/06/2005                  50,000                    10.04
              12/07/2005                  37,000                    10.29
              12/13/2005                   7,750                    10.53
              12/14/2005                  15,614                    10.55
              12/15/2005                   9,000                    10.60
              12/28/2005                   1,000                    12.51
              12/29/2005                   2,200                    12.29
              01/31/2006                   1,000                    13.41
              03/30/2006                   6,745                    13.76
              03/31/2006                   1,650                    14.79
              04/10/2006                   1,000                    15.06
              05/31/2006                    600                     18.00
              06/13/2006                   1,450                    16.92
              06/30/2006                   3,000                    17.80
              07/12/2006                    800                     18.06
              07/25/2006                    400                     18.43
              07/31/2006                    200                     19.00
              08/29/2006                    200                     19.08
              08/31/2006                    200                     18.78
              09/13/2006                    600                     18.55
              10/20/2006                    200                     19.08
              12/05/2006                   1,300                    18.26
              12/07/2006                   2,100                    18.72
              12/08/2006                    268                     18.91
              12/12/2006                    300                     19.26
              12/14/2006                   2,200                    19.09
              12/29/2006                   1,100                    19.92
              01/16/2007                   1,200                    18.02
              01/18/2007                    200                     18.56
              01/23/2007                   2,600                    18.31
              01/24/2007                    200                     18.41
              01/24/2007                   1,800                    18.36



                                    Page 12


            DATE OF PUCHASE          NUMBER OF SHARES OF        PRICE PER SHARE
                                       PREFERRED STOCK                ($)
                                          PURCHASED
================================================================================

              01/25/2007                    200                     18.56
              01/26/2007                    500                     18.53
              01/31/2007                   1,600                    18.15
              02/07/2007                   8,000                    17.30
              02/07/2007                    300                     17.89

--------------------------------------------------------------------------------
                Total                     164,477               1,979,869.01






                                    Page 13





                                                                       EXHIBIT D

                             JOINT FILING AGREEMENT

         The  undersigned  agree that they are filing  jointly  pursuant to Rule
13d-1(k)(1) of the Securities Exchange Act of 1934, the statement dated February
13, 2007  containing the information  required by Schedule 13D,  relating to the
preferred stock of Telos Corporation, on behalf of the undersigned.


Dated: February 14, 2007                 Grand Slam Capital Master Fund, Ltd.




                                         By: /s/ Mitchell Sacks
                                         ---------------------------------------
                                         Name: Mitchell Sacks
                                         Title: Director


Dated: February 14, 2007                 Grand Slam Asset Management, LLC




                                         By: /s/ Mitchell Sacks
                                         ---------------------------------------
                                         Name: Mitchell Sacks
                                         Title: Member




                                    Page 14