 The ARVN defenders of An Lộc were made up of several units of the 5th Division, including the Division's 8th Regiment with about 2,100 men; the 7th Regiment which was short one battalion and only had 850 men; the 9th Regiment, most of which was destroyed at Lộc Ninh had only had 200 men; Task Force 52, 500 men; the 3rd Ranger Group, 1,300 men; as well as Binh Long Provincial Regional Force, Popular Forces, and People's Self-Defense Forces (PSDF), about 2,000 men.The defenders were later reinforced by the elite 81st Airborne Commando Battalion and the 1st Airborne Brigade, brought in by air because QL-13 was blocked by the PAVN.Because the ARVN defense had little artillery, it was heavily reliant on U.S. air support.