The Air Force issued the request for proposals for the KC-X aerial refueling aircraft on Feb. 24, 2010. The service wants 179 new KC-X tankers to replace its oldest KC-135s. Prospective bidders Boeing and Northrop Grumman now have 75 days to turn in their bids, followed by 120 days of proposal evaluation, leading to the planned announcement of a winner around mid-September 2010, Deputy Defense Secretary Bill Lynn told reporters during a Pentagon briefing. Here, members of a KC-135 aircrew prepare for a mission from Andersen AFB, Guam, Feb. 17, 2010.
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