This was combat - in Afganistan - and at high altitude. This was the same program where they ran out of Canadian issue 50 cal and switched to American - apparently shoots farther thus have to change sight settings.
They will probably have a repeat showing - cable always does.
heh heh heh -
A related program on the training these guys have to go thru is fascinating. Also the Marine Corp prep of the rifles and loading the bullets was good - we are not talking factory here.