 In an emergency the 18th Infantry Division based at Biên Hòa could reach Phước Long in the shortest period of time, and the next closest unit was the 5th Infantry Division based at Bến Cát.In addition, Lieutenant General Dư Quốc Đống could have access to the 81st Airborne Ranger Battalion and more than one hundred helicopters, mainly UH-1 Huey and CH-47 Chinook models.While air support could come in the form of fighter-bombers from the 3rd and 5th Air Divisions of the Republic of Vietnam Air Force (RVNAF), based at Tan Son Nhut Air Base and Bien Hoa Air Base.