Head: '91 Tracker
Torso: '90 Rock Viper
Arms: '92 Duke
Waist: '92 Duke
Legs: '92
I was always a big Tracker fan, largely because he was one of the first SEAL figures that you could use out of the water. Torpedo and Wet-Suit were largely relegated to just underwater missions because of their dive suits and gear. Needless to say the figure got a lot of play from me as a kid. Even as an adult he's always had a relatively prolific role in my collection.
This custom was a relatively simple one, and the goal was just to tone down the brighter colors of the original.