the Battle of Ia Drang. While sustaining heavy casualties, the 2nd and 3rd Brigades estimate that they killed more than 1700 PAVN soldiers and destroyed two full regiments of a PAVN division. For its actions during Operation Silver Bayonet, the 1st Cavalry Division earned the first Presidential Unit Citation awarded to a unit in Vietnam. On 4 January 1966, 2nd Brigade participated in Operation Matador. Along with 1st Brigade, they air assaulted within the Bình Định Province to conduct a search and destroy mission against the PAVN 3rd Division. During this operation the units witnessed enemy soldiers fleeing into Cambodia, confirming for the first time the PAVN's use to sanctuaries in the neighboring country. On 7 February 1966, 2nd Brigade took part in Operation White Wing, where they again conducted a search and destroy mission targeting the 3rd Division. All three regiments of the 2nd Brigade deployed to the Iron Triangle, a well-fortified defensive position thought to be the regimental headquarters of the PAVN in the Bình Định region. On 6 March 1967 Operation White Wing concluded as a major tactical success. 2nd Brigade maintained constant contact with the enemy over the entirety of the operation. Five of the 3rd Division's nine battalions were rendered combat ineffective and the PAVN temporarily lost its grip on the Bình Định Province. On 16 May 1966, 2nd Brigade took part in Operation Crazy Horse, a search and destroy mission against the 2nd Viet Cong Regiment in the jungle covered hills between Soui Ca and the Vinh Thanh Valleys. For his heroic actions in support of Operation Crazy Horse, 2nd Brigade's SSG Jimmy G. Stewart was awarded the Medal of Honor. 2nd Brigade next participated in Operation Paul Revere II, where the first and second battalions of the 5th Cavalry Regiment inflicted heavy casualties on an enemy battalion at the Battle of Hill 534. On 13 September 1966, 2nd Brigade participated on Operation Thayer I, a search and destroy campaign in the Bình Định Province which would involve one of the largest air assaults ever attempted by the 1st Cavalry Division. 2nd Brigade's PFC Billy Lauffer was awarded the Medal of Honor for his heroic actions in support of Operation Thayer I. On 31 October 1966, 2nd Brigade launched Operation Paul Revere IV, a search and destroy campaign focusing on Chu Pong, the Ia Drang Valley and the Cambodian border area. C Company, 1/5