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https://www.marines.com/becoming-a-marine/enlisted.html
https://www.hqmc.marines.mil/Agencies/Office-of-Legislative-Affairs/Congressional-Correspondence-Section/Enlistment-Re-enlistment/
http://www.militaryspot.com/enlist/what-is-the-maximum-age-limit-for-each-branch-of-the-military
https://www.todaysmilitary.com/joining/marine-corps
https://www.quora.com/What-is-the-age-cut-off-for-joining-the-Marines
https://www.usmc.net/marines_delayed_entry/