Grunt (ɡrənt):
Infantrymen in the Army & Marine Corps, grunts are the military's door kickers & trigger pullers, in short, they're the pointy end of the spear. Blue Collar Worker.

United States Marine Corps
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Jar·head (ˈjärˌhed):
A member of the U.S. Marine Corps
Veteran Owned & Operated.
Grunts choose to live a savage and spartan life. You become intimate with violence, killing, pain and suffering. Your acquaintances are the cold, the dirt, filth and loneliness. You live in a perpetual state of exhaustion. Your bonds are deeper; the losses are greater. The one thing you can always embrace: the suck. It's constant and omnipresent. Grunts don't merely survive; we thrive in the chaos. This is all part of the Infantryman's Symphony. It's beautiful. It's horrible. It's the Grunt Life.

United States Army

Pa·tri·ot (ˈpātrēət):
A person who vigorously supports their country and is prepared to defend it against enemies or detractors.