a veteran
A military scientist
A person who studies ancient weapons might be a military historian, or might be an archaeologist. There is more than one reason to study ancient weapons.
Furlough.
They did (and still do) call those guys civilians.
You call the person a victim.
you call this person a "confidante"
A person who is not a member of the military or the police force.
you call them a tired person =-=-= or you could call them asleep
Civilians.
Push
A Fleet