A platoon in training I would say. All fresh recruits other than the four standing in the middle. Two officers, one decorated. The two men standing immediately either side of them have NCO candidate stripes on their shoulder boards, and both are decorated, indicating they have shown their mettle in combat and are considered bright enough to progress up through the ranks. As well as learning to become NCO's, they will have been training the recruits, their recent front-line knowledge invaluable. Photo possibly taken at a field replacement battalion? Possibly a SSTK cuff title in view?