five and fly
n.— «Hamm, of the Air Force Academy, countered that the attitude of quitting after the required five years—known as “five and fly”—was “a minority view.…One of the reasons for the exodus now is the airlines’ hiring.”» —“Academies hid expenses, audit reveals” by Keith C. Epstein in Washington, D.C. Plain Dealer (Cleveland, Ohio) Apr. 5, 1990. (source: Double-Tongued Dictionary)