Doctor Who
Ross Jenkins

16
Private Ross Jenkins was a soldier in the Unified Intelligence Task Force, also known as UNIT, where his callsign is Greyhound 40. Ross appeared throughout the Poison Sky arc of Doctor Who, where he escorted The Tenth Doctor, becoming friends with the Gallifreyan before being killed by Sontarans in their invasion of Earth. But when this takes place, the Sontarans have yet to start the attack, and Ross lives. Ross had a good sense of humor, as well as a tendency to make the best out of a situation, and was an excellent soldier.
"That wasn't Greyhound 40, his name was Ross." -The Tenth Doctor to Colonel Alan Mace after Ross's death