Iceberg's real name is Clifton L. Nash, and his rank is that of sergeant E-5. Iceberg was born in Brownsville, Texas.
Iceberg's primary military specialty is infantry, and his secondary military specialty is cold weather survival instructor. Iceberg hates hot weather, so much so that when he was old enough to enlist in the Army, he signed up and asked for duty in Alaska. His a qualified expert in the M-16A2, M-79, M-60, and M-1911A1.
In the Sunbow G.I. Joe cartoon, Iceberg is voiced by Arthur Burghardt. He first appeared in the animated series in the second season episode "Arise, Serpentor, Arise!: Part I". He also appears in the following episodes:
- Computer Complications
- G.I. Joe: The Movie
- Iceberg Goes South
- Into Your Tent...
- Joes' Night Out
- Most Dangerous Thing In The World
- Nightmare Assault
G.I. Joe: The Movie
Iceberg also appeared briefly in the 1987 animated film G.I. Joe the Movie.