Senator wants Marines to explain why wounded troops weren't told the truth. Elena Zurheide was told her husband Rob was killed by enemy fire while he was deployed in Iraq in 2004. The Marines To enlist as a Marine, you must obtain your high school diploma and be a legal U.S. resident between 17 and 28. To commission as a Marine Officer , you must be a United States citizen between 20 and 28 and have obtained both a high school diploma and a bachelor's degree. Joining the Marines involves testing your physical strength, endurance, mental resilience and military fitness. Learn more about how to enlist in the Marines. You cannot join the military to enter the U.S. or to get a visa. Age limits. Each branch of the military has age limits to enlist in active duty: Air Force: 17 - 39; Army: 17 - 35; Coast Guard: 17 - 31; Marine Corps: 17 - 28; Navy: 17 - 39; Space Force: 17 - 39; The age limits are different if you join as an officer or join the Guard or Reserve. .

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