There’s no one type of person who serves in the military — tough guys like Clint Eastwood and Chuck Norris might seem to fit the mold, but nonconformists like Willie Nelson and Jimi Hendrix served too. Leonard “Mr. Spock” Nimoy, Wheel of Fortune‘s Pat Sajak, and Playboy founder Hugh Hefner all served. These fascinating photos show future stars and celebrities when they were just kids, really, unaware of the fame that lay in store and doing their duty in the meantime. For vintage photos of celebrities in the U.S. Army, Navy, Air Force, Marines, and Coast Guard — as well as a couple from the Austrian army and British Navy — read on.