Chuck Hagel's Chevron tie not criticized Since 2010, Hagel has served on the board of Chevron Corp., a position he would have to leave if he wins Senate confirmation as defense secretary. [...] critics of the "revolving door" between the federal government and the private sector haven't raised any complaints about Hagel. "The decisions on fuel procurement are fairly low on the radar screen of a defense secretary," said Tyson Slocum, head of the energy program at the Public Citizen watchdog group. [...] the Senate Armed Services Committee would require him to financially divest himself of his Chevron holdings, either by selling them or placing them in a blind trust, said Joe Newman with the Project on Government Oversight. Praise for PentagonEnvironmentalists who have been pushing Obama to take action on climate change have praised the Pentagon for taking concrete steps to improve its energy efficiency and test alternative fuels. [...] while an oil company board member may seem an unlikely champion for biofuels, Chevron is an investor in one of the startup businesses supplying those fuels to the Pentagon - Solazyme, based in South San Francisco. A coalition of human rights activists has criticized Chevron's behavior around the globe, accusing the company of fouling the environment and working with repressive regimes in places such as Burma and Nigeria.