GI Joe Veteran

Any person who has served in two different branches of the United States military, Army, Navy, Air Force, Marines, Coast Guard, a combination of any two.

Famous porn producer Larry Flynt is a veteran of the the U.S. Army, (which he lied about his age to get in), and the U.S. Navy. Larry Flynt is a GI Joe Veteran.

Veteranism

Patriotic principles and genuine activities relating to an individual's personal feelings about being a Veteran of the United States military.

"His Veteranism made him challenge the land-use policy that excluded homeless Veterans from the VA Home"
"Her Veteranism motivated the creation of the 'She-does' campaign to provide shelter for homeless female Veterans"
"His Veteranism helped him coin the phrase 'the word satisfied must not exist in the vernacular of Veteran advocates'"

pine veteran

A sportsman who is consistently on the bench due to poor performance.

Yeah he was decent last season, but he's become a bit of a pine veteran this year.

veteran tree

A tree that is epercenced in photosynthesis.

Phill has a veteran tree in his backyard.