Huh, my Uncle Tim served in Beirut.
Interesting story actually. His barracks was apparently bombed and he was "on guard duty". Turns out he and his best friends had swapped their shifts that day, so his friend died while he lived. I guess he cheated death, but it's unfortunate for his friend.
When I was done watching the movie I remembered about my uncle talking about his injury in Beirut, I asked my dad about it for more details, apparently he was there and was injured in the leg by a grenade while getting out a truck, this place was a mess.