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。

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The F-35s, intended to replace an aging aircraft arsenal, were developed as part of a Joint Strike Fighter program between the U.

意欲取代一种老式战机的F-35战机作为联合攻击战斗机项目的子项目由美国和其盟友联合开发。

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Syscat.tabconst Contains a row for each unique (u), primary key (p), foreign key (f), or table check (k) constraint db2 select constname, tabname, type from syscat.tabconst.

tabconst为每个唯一性(U)、主键(p)、外键(f)或者表检查(K)约束保持一个行db2 select constname, tabname, type from syscat . tabconst。

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That same year, then President John F.Kennedy vowed in a speech before the U.S.Congress to put a man on the moon.

VOA: standard.2009.07.16

and the same for favour, they spell f-a-v-o-r, we put u in it,

同样地，对于发烧这个单词，他们拼写成f-a-v-o-r，我们要加一个u在里面，

美式英语和英式英语 - SpeakingMax英语口语达人

A U.S.Air Force spokesman described the maneuvers of pilots aboard its F-15e Strike Eagle.

VOA: standard.2009.11.15

Pentagon sources say a U.S. F-16 shot down a Yugoslav MiG-29 on Monday night near the border between Bosnia and Serbia.

CNN: NATO pounds Yugoslav targets after flurry of diplomacy

That is why we get a plague of U.F.

NEWYORKER: Cowboys & Aliens

However, nobody would seriously consider using a Predator to carry out most of the missions assigned to F-16s, and the U.S. has been conducting unmanned aircraft operations in Southwest Asia for a long time now.

FORBES: The Revolution In Unmanned Aircraft Is Overrated