To promote America's Army: Overmatch, a free game created by the Army as a recruitment tool, a group of Army Special Forces personnel staged an urban tactical assault exercise outside the L.A. convention center where the E3 gaming expo was taking place. It may have been a staged promotional event, but judging from the panicked expressions on pedestrian faces, some may have thought it was the real thing.

(Wired, via BoingBoing.)