In April 1965, MASS-2 deployed to South Vietnam as part of the III Marine Amphibious Force and provided both Direct Air Support Centers and Air Support Radar Teams (ASRTs) in support of ground combat units. MASS-3 entered Vietnam on 10 November 1966 when they disembarked from the at Chu Lai. MASS-2 supported the 3rd Marine Division in the northern two provinces of I Corps while MASS-3 worked in support of the 1st Marine Division in the southern three provinces of I Corps. From 1966-1971, MASS-3 ASRTs controlled more than 38,010 &lt;a href="AN/TPQ-10"&gt;AN/TPQ-10&lt;/a&gt; missions, directing more than 121,000 tons of ordnance on 56,753 targets. (a 10:1 ratio) The ASRTs utilized the AN/TPQ-10 with great success, especially during the Battle of Khe Sanh, where poor weather made conventional close air support methods unreliable. The AN/TPQ-10 had a Circular error probable and could handle up to 105 missions a day. The commander of the Khe Sanh defense, Col. David E. Lownds, said "Anything but the highest praise would not have been enough." By the end of the war, the DASCs and ASRTs participated in virtually every major Marine combat operation.