Some Americans become doctors by joining the United States Army, Navy,Air Force or Public Health Service.

VOA: special.2010.07.13

So it's marine force, air force, navy and army.

那就包括海战队和空军，海军和陆军。

普林斯顿公开课 - 国际座谈会课程节选

The Army and Air Force built the Redstone, Jupiter and Atlas rockets.

VOA: special.2009.06.17