Barnes orders the rest of the platoon to retreat to be airlifted from the area, and goes back into the jungle to find Elias's group. After sending Taylor, Rhah, and Crawford (who has been shot in the lung) back, Barnes finds Elias.
Although he was a minor character he seemed to be part of the tight knit group with King and soon Taylor. But I wonder if a hit in the lung would be a mortal wound during the Vietnam War?
You see Crawford @ 7:10
EDIT:
You see him again @ 3:08