Looking at the original photo again, I suspect it’s a custom made load bearing vest over an M65 jacket. Maybe it’s just me but there seems to be a difference in texture between the material around the main torso, with that on the sleeves and bottom hem. It was notably cool in Hue during the 1968 Tet Offensive and the M65 has a hood which tucks up inside the collar. I still have one, somewhere.
Matters not, just gives two painting options for the same figure.
Might I ask though that when sorting these types into packs, they go into a ‘Hue character pack’? The trouble with unique figures is that you don’t really want one in every pack.