John Chapman was a US Air Force combat controller. These guys work closely with units on the ground to help deliver assets to the battle. (That's a gross over-simplification).
Early in the Afghan unpleasantness, Chapman was assigned to the theater, and was present at the battle for Takur Ghar, and was involved in an action in which he was killed, and for which he first received the Air Force Cross, and was ultimately up-graded to the Medal o Honor.
What is amazing, other than the valor and intrepidity of Sergeant Chapman was that the entire engagement was caught on film.
Trigger warning. This is combat footage where men fight and die.
Amazingly, there was another Medal awarded for this action. Navy Chief Britt Shabinski was also awarded the Medal for this action.
I am in awe of men like this.