The aircraft is displayed under cover in the USAF Gallery.

【cover】这架飞机在美国空军陈列室内展出。

Anyway, the USAF announced that they could not follow up on all 400 of the reported UFO sightings.

我没有读到过具体的报道。无论如何，美国空军宣布他们无法对所有400起报告的不明飞行物目击事件进行跟进调查。

The United States Air Force (USAF) is re-engining its B-52 fleet through the Commercial Engine Re-engining Program (CERP).

美国空军 (USAF) 正在通过商业发动机重新设计计划 (CERP) 重新设计其 B-52 机队。

The B-52, often known as the Stratofortress or the Buff (Big Ugly Fat Fellow), is the USAF's long-range, large-payload multirole bomber.

B-52，通常被称为“Stratofortress” 或“Buff” （丑陋的大胖子），是美国空军的远程、大有效载荷多用途轰炸机。

The USAF issued bid invitations for these requirements on February 13, 1946, with Boeing, Consolidated Aircraft, and Glenn L. Martin Company submitting offers.

美国空军于 1946 年 2 月 13 日针对这些要求发出招标邀请，波音公司、联合飞机公司和格伦·马丁公司提交了报价。