Junior Juniper was a young man whom joined the Allied forces to fight against the Nazi's during World War Two. He was recruited to become part of Sgt. Fury's Howling Commandos and was a valuable asset to Nick Fury's troops.
Junior Juniper was created by Stan Lee and Jack Kirby and first appeared in #Sgt. Fury issue 1 (1963).
Major Story Arcs
Junior Juniper has the distinction of being the first recurring character to die in a Marvel comic (In Sgt. Fury issue 4), and the only Howling Commando to perish in battle. Junior Juniper is remembered yearly on a reunion of the living remaining members of the Howling Commandos.
Earth - 1610: Ultimate Universe
In the Ultimate Universe, instead of joining the Howling Commandos, Junior fought under Sgt. Rock, and simply died of old age.