Over the last five years, Boeing, the U. S. Air Force and Navy, Honeywell UOP and others have systematically tested and advanced the alternative fuel.
在过去的五年里,波音公司,美空军、海军,霍尼韦尔环球石油公司等都已经系统性的测试并完善了这些新能源。
The zone was tested on Feb. 28, 1994, when six Serbian fighter planes were shot down by U. S. Air Force F-16s, in what became known as the Banja Luka incident.
1994年2月28日该禁飞区进行了试验,6架塞尔维亚战斗机被美国空军f - 16战机击落,也就是后来大家所知道的巴尼亚·鲁卡事件。
The U. S. Air Force also will operate an F-35 variant, the a model, a conventional takeoff-and-landing fighter.
美国空军也将经营新的F - 35的变种A型,一种传统的起飞和着陆战斗机。
The F-35 will be used by the U.S.Air Force and also by the Navy to fly off of aircraft carriers.
VOA: standard.2009.07.21
U.S.military helicopters deployed in military exercises in the southern Philippines assisted the Philippine Air Force and Navy in the search and rescue operations.
VOA: standard.2009.09.06
A U.S.Air Force spokesman described the maneuvers of pilots aboard its F-15e Strike Eagle.
VOA: standard.2009.11.15
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