Flame, Riot Control Agents and Herbicide Operations - MCRP 3-37C - FM 3-11

The US has renounced first use of herbicides in war except under regulations applicable to domestic use or for control of vegetation within US bases and installations and around their immediate perimeters. The US has renounced the first use of RCAs in war. US forces will only use RCAs in war in defensive modes to save lives as approved by the President. In wartime, use of RCAs outside the war zone is authorized as prescribed for peacetime.