They probably got hit by enemy fire. What do you think happened?
Hit by enemy small arms fire
Hit by friendly fire
Hit by enemy large caliber fire
Ran over by friendly tank
Ran over by enemy tank
Stepped on landmine
Hit by helicopter rotor
Hit by enemy grenades
Hit by friendly grenade
Ammo storage explosion
Noxious fumes from exhaust malfunction
Hit by falling debris from building
Theres a million ways to die in a combat zone, and its not some mortal sin to be curious as to the cause of death.