I’ve only known one person who can legitimately put that on his resume (I’ve seen his citation & bronze star). He is a quiet, unassuming and genuinely nice guy. I grew up with him and he’s always been that way. He did tunnels for about half a tour until his last trip down - the one where he said nope, never again. He said he came to a tee and could hear someone breathing but he couldn’t tell if it was left or right, and, while trying to decide, a grenade bounced off of his shoulder. He immediately decided left,left,LEFT - sticking his hand around the corner and emptying a .38 revolver, putting a round in the guy’s head. He then realized the grenade must be a dud or he’d be dead by now, and worked his way out of there as fast as he could. He said when he got out the first thing he did was tell his Lt that’s it. Never again. I’m done….. He’s still around, retired, still a great guy, but does admit to the occasional nightmare, although less frequently with the years…
Being claustrophobic, I have no idea where those brave young boys found the courage to do that…