In his bid to become Secretary of Defense, former Sen. Chuck Hagel has come under fire from both the left and right for his comments on Iraq, Israel and gays. His membership on the board of one of America's largest oil companies, however, has caused barely a stir. 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. He received $301,199 in compensation from the San Ramon company in 2011, including $184,000 in stock. Chevron is a major federal contractor, with more than $501 million in sales to the U.S. government in the last fiscal year. But critics of the revolving door" between the federal government and the private sector haven't raised any complaints about Hagel. That's largely due to the nature of Chevron's federal contracts. Almost all the money Chevron made from the U.S. government in fiscal year 2012 came from selling fuel to the Pentagon, according to a government website that tracks federal spending. Chevron, the nation's second-largest oil company, has a history of politically connected board members. Condoleezza Rice served on the company's board before becoming national security adviser for President George W. Bush. The practice of former federal officials landing jobs with government contractors - and vice versa - has long angered many government watchdogs. They were appalled when Obama, early in his first term, nominated a lobbyist for the Raytheon Corp. to serve as deputy secretary of defense.