The trooper on the left is flagging his buddy. Are they Rhodesian? I don’t recognize the camo pattern.
Indeed. The camera angle makes it look like the R1 is pointed his way, but those lads were so scrupulous about muzzle discipline that I suspect that there's a bit of camera angle involved. Grey's Scouts could be a little more sporty to be around, as their horses didn't always cooperate, so usually carried their gats muzzle skyward when possible. And the lads in Armoured Cars could be a bit risky to be around.
The only AD I saw, which holed the borrowed VW Rabbit I was using, though not while I was in it, came from a .303 Browning MG on a RhAF base where an armourer had failed to clear a gun properly. He let the bolt go forward, with no belt in place but with one round in the feedway, and BANG!. Of course, if there's been a belt in, there would have been a great many bangs, those aircraft guns ran at around 20-25 rounds/second.
The green beanies mark the troopies around the Mog mortar carroer as Rhodesian Light Infantry, reckoned by many, including themselves, to be Rhodesia's Best.