At 18 can vote and serve. Full citizen or not a citizen
https://www.swlaw.com/publication/reese-v-atf-fifth-circuit-strikes-down-federal-handgun-purchase-ban-for-18-to-20-year-olds/
Given a shovel and allowed to dig from sun up to sundown. Then lowered into hole with a bucket and a cover placed on the hole. They stayed ther until sentence complete.
Bucket used to raise waste and lower food/ water if provided.
Travelling light: pistol in holster maybe a spare mag. Not really expecting trouble ready for defense.
Travelling heavy: loaded for bear or a walk down mainstreet falluja. Long gun spare mags, pistol spare mags, armor. A couple buddies...
And since it's NCIS at least 2 knives.