I was a rifleman back then, if you were not a C9 gunner, the utility pouch was used for cam sticks, gun cleaning stuff and a field message pad, extra butts, choc bars. I left IMPs in the outer pockets of my ruck whether light infantry or mech infantry. Rain coat went in the butt pack with any other personal stuff (I carried a soild fuel stove I got from Suffield Brits).