Meet Corporal Kyle Carpenter. Because once you do, you probably won’t ever forget him.

Kyle was a 19-year-old Marine serving in Afghanistan when a grenade attack almost killed him.

Hear what he pushed through, a list of injuries that — for one to actually survive — is truly inconceivable. Not only was he awarded the Medal of Honor, on Letterman (in the clip above) — he also finished the Marine Corps Marathon after undergoing more than 40 surgeries.

Cpl. Kyle Carpenter is only the second living Marine to receive the Medal of Honor since the Vietnam War.