what age can you still go back into the marine corps?
For example, let's say that an individual has four years of credible military service in the Marine Corps and wants to join the Air Force. The Air Force could waive the individual's maximum enlistment age to age 31 (Maximum age of 27 for the Air Force, plus four years credible service in the Marines). For the Marine Corps and the Marine Corps Reserve, the maximum age of enlistment for prior service is 32, after computing the prior-service age adjustment.