Indeed, all the "tribarrels" (equivalent to the M2 Browning used in Vietnam (or, rather, back from 1933 to today, it's a keeper)) could be/were slaved to the an

Indeed, all the "tribarrels" (equivalent to the M2 Browning used in Vietnam (or, rather, back from 1933 to today, it's a keeper)) could be/were slaved to the anti-artillery and air network, and could be automatically taken away from their operators to stop an incoming barrage. They had proximity fuzed Claymore style anti-"buzz bomb" defenses, but arming those was problematical for a zillion reasons, the best defenses were as they are today, sharp eyes and trigger fingers. Later killing a buzz bomb team that killed a super expensive tank and its crew was not considered an acceptable exchange.