This video starts with Marines engaged in a firefight against the Taliban in the Afghan countryside in 2012. All of a sudden, around the 0:50 mark, shots are fired and the helmet camera scans to the left as a Marine goes down. The next thing you hear is him yelling, "aghhh, aghhh, I'm f--king hit!"
The Marine settles into a state of temporary frantic but is quickly calmed when his battle buddy comes to assist. Trained for this type of scenario, the assisting Marine methodically removes his buddy's gear to get to the wound while yelling for a corpsman.
The corpsman arrives, treats the wounded Marine, and by the end of the video the Marine walks himself to the helicopter on his own for evacuation.