See the wide age ranges for the different branches of active-duty military:
Army: 17 to 35.
Navy: 17 to 39.
Air Force: 17 to 39.
Marine Corps: 17 to 28.
Coast Guard: 17 to 27.
Beginner fitness programs — Every expert was a beginner at one time. …
Army fitness tests — Preparing for Army service in the next year or two.