Israeli Phalanx Close-in air defense system (by Raytheon) engaging incoming missiles.
This is part of Israel’s “Iron Dome” defense system. There appear to be at least two high speed guns out of view of the camera, maybe more. At least 50cal. or maybe 20mm for the range they are shooting. The white can in the foreground appears to be for close-in fire, in the event the longer range guns do not do the job. All this is radar/computer controlled, no human action except to turn it on. What we are seeing are real shoot-downs, rockets launched probably from Lebanon aimed at Tel Aviv or other populated targets. This is cutting-edge American technology.
HT: Henry Bernatonis.