Combat Engineer

“Serve as the Swiss Army knife of the Marine Corps, trained in demolitions, breaching, obstacle construction, route clearance, and combat construction. Combat engineers lead from the front, clearing the way for Marines to close with and destroy the enemy.”

You are going to blow things up, which is genuinely as satisfying as it sounds. You are also going to dig fighting positions, clear IED threat routes using methods that involve getting close to things that might kill you, build obstacles at night in terrain that is actively unpleasant, and become deeply expert in explosives — C4, det cord, M112, breaching charges, cratering charges, the whole family. The demolitions training alone justifies the MOS. What the recruiter glosses over is the route clearance mission, which is among the most psychologically taxing in the Corps: slow, methodical movement through ground that may or may not contain things designed to kill you, requiring sustained focus and threat awareness over hours. Combat engineers in the last twenty years have absorbed casualties doing this mission that the infantry bias in the Corps sometimes doesn't fully acknowledge. The every-Marine-a-rifleman ethos is most literally true for combat engineers.