ARVN Paratrooper riflemen. No helmet covers.
 
From left to right;
 
Carrying M79 Blooper with ammo belt for grenades. Smoking a cigarette.
 
M16 Rifleman carrying a fragmentation grenade, phosphorous grenade, and LAW's. 
 
M16 rifleman wearing a locally made jacket/ vest with stitched pockets and back pack for spare ammo.
 
M16 rifleman crouching wearing standard cammo or green combats.