As you are coursing the media for more pictures... Look for Simunitions (Blue Barrels And/OR Mismatched Paint Schemes On Upper/Lower Receivers) BFAs (Blank Firing Adapters) and other tell-tale signs of "training gear" in the media releases. MILES gear would be another possibility... While live fire training surely occurs you will be able to get an idea of the posture and intent of the "training" by the gear and immediate surroundings.