I was watching a WWII vid, (Victory at Sea) and they referend to the Army as Soldiers and the Marines as Sailors. I'm an USAF Vet and now this has me wondering. I wouldn't want to insult anyone. It's never come up to me before. Even though in my day I shared a house with another AF NCO and a USMC 1st Louie chopper pilot. We just called them Jar Heads.