Lordy-be, those two guys are listening for engine rattle - lifters/rods/valves not seating properly, etc. A good mechanic can walk by an idling engine and tell you if its timing is off. Listen close and they can do more diagnostics than you would believe. I bet they each got a pack of Salems for their troubles too. The gunner is bored sh**less looking around, away from his weapon and this is supposed to be a propoganda piece? If it was going to be propoganda for our side at least they should have been given a wrench to hold in their hands.