That’s South African surplus (R1M1) in the battle packs. Good stuff, though I suggest spot-checking the ammo in the battle packs over time. Some of us got burned to varying degrees with German and Portugese surplus (same packaging—cardboard boxes in rubber packs) that didn’t react well with the cardboard packaging over the years.
I finally unpacked all my 1994 German surplus, culled the worst of the corroded rounds, and repacked it loose in ammo cans.