Head, torso, waist - Falcon
Arms, legs - Lonzo R. Wilkinson
Rifle - Frostbite (modified) with suppressor from Marauder Inc.
Backpack - Recondo
In Vietnam, Stalker, Storm Shadow and Snake Eyes all served in the same Long-Range Recon Patrol (LRRP) unit. The other members of the team were Dickie Saperstein, Ramon Escobedo and Wade Collins, all three of which apparently died in a firefight. The surviving members later found out (in comic issue #42) that Collins had actually survived, and become a Cobra Crimson Guardsman. Some of Larry Hama's finest GI Joe storytelling to be sure.
Since I've already done several Stalkers, I wanted to try using some different parts - specifically, avoiding the use of an actual Stalker head. Since a green beret was needed, Falcon's head was the top candidate, and since other Falcon parts were used for other figures in the LRRP unit, I had one available. Other than that, it's a pretty standard Vietnam-era military look, based on the character's appearance in uissue #26 of the Marvel run.