No matter what my job in Vietnam, there were certain pieces of equipment I always carried on this belt and harness. Of first importance were canteens and several pouches with field dressings. Two ammo pouches occupied the front. Typical of Army supply philosophy, we were issued M-14 magazine pouches, which were much too large for our smaller M-16 magazines. The three 19-round magazines flopped about in the pouch. On the outside of each pouch, straps held two grenades and secured the handles so they couldn't accidentally come loose (I also carried four grenades suspended from my shoulder straps).
Of course the six magazines these two pouches carried wasn't nearly enough, so I also carried a used Claymore mine bag, with the dividing stitching ripped out, which held fourteen magazines. One magazine in my rifle, six on the belt, and fourteen in the pouch - I carried almost four hundred rounds of M-16 ammunition. And several times I used almost every one!