Spikes Men
The weapon in the centre of the picture is a .50 calibre Browning - same size of round that the 12.7mm Sphagin used.
The rounds can defeat light armour and the weapon is so versatile that it has been adapted for use as a single shot sniper rifle. Mounted on a vehicle such as this it would outrange any of the usual infantry weapons that the adoo might carry. The adoo's equivalent would have been the 12.7mm DShK or Sphagin which was man portable when broken down but only with difficulty.
 
RAF Salalah