Hi MM,
I'm seeing an apparent dissociation between the guys on the ground and the guys in the 251.
The guys on the ground are doing something (I'm not sure what they're supposed to be doing, re-arming the 251 perhaps?). The one closest to the front appears to be stalking someone, but he's peering around the corner in the direction of his buddies.
The guys in the track are gazing off into the distance with their backs to the guys on the ground, seemingly oblivious of what's going on behind them.
If the guys on the ground are meant to be the focal point of the scene, the view is obstructed by the 251 right in front of them (between them and the viewer) and by the walls of the ruins.