In 1967 and 1968, he served in the Chemical Section, 1st Infantry Division, where he helped develop operations with the XM2 personnel detector manpack (the "people sniffer") and its conversion to an
airborne detector. Sergeant Major Wilson accumulated more than 100 combat air missions in Vietnam, using the manpack to locate enemy personnel and then dropping riot control agent ortho-chlorobenzylidene malononitrile (CS) to deny them free movement and use of terrain.