0317名無し三等兵
2020/04/28(火) 23:37:30.70ID:rrZyuhZPUS Air Force issues draft request for proposal to replace B-52 engines
28 April 2020 FlightGlobal
ttp://www.flightglobal.com/fixed-wing/us-air-force-issues-draft-request-for-proposal-to-replace-b-52-engines/138099.article