For an Officer in the U.S. military, what happens after their initial commitment? I know that enlisted men either leave or re-enlist for a certain amount of time once their initial enlistment period is up. What does an officer do? Do they sign a commitment for another X amount of years or can they leave at any time once their initial commitment of 4-10 years is up? I'm sorry if you are having trouble understanding my question. I had a hard time figuring out how to word it.