 Unfortunately, Hưng was the one ARVN officer whose candidacy American advisers had specifically recommended against.Living in a tiny underground bunker for almost three months, Hưng commanded soldiers of the 5th Division, the 81st Airborne Ranger Battalion, the 11th Airborne Brigade, the 21st Division and the Provincial Forces of Bình Long Province.His forces repelled countless waves of attack by the PAVN infantry, supported by T-54 tanks.