Is it hard to join the United States air force?

Joining the United States Air Force always begins with talking to a recruiter. The recruiter will tell you about the various benefits of joining the Air Force , and help you identify a career you...

Sept , 18, 1947

If by cadet you mean somebody at the U.S. Air Force Academy, then yes you are required at least five or six years following graduation.

In land - Eglin AFB in northwest Florida, at 724 square miles

Originally it was the Army Air Corps. Or Army Air Force. It changed after WWII and on Sept, 18, 1947 is became it's own branch of the service known as the "United States Air Force."