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Can a 70 year old serve in the military? Age limits and waiver possibilities

According to USA.gov, all US military branches have maximum age limits for enlistment, with the Space Force currently setting the highest at 42 years old. This means that, under standard regulations, a 70 year old cannot serve in the military. However, there are potential pathways for older individuals with specific expertise or prior service to contribute to national defense, primarily through waivers or civilian roles.