Steel" divisions of the 308th Division, 304th Division and 325th Division. This was the single bloodiest, longest and most intense engagement in the entire war and the most defining urban battle, far surpassing the Battle of Huế in all respects. 1st Armored Brigade, Army of the Republic of Vietnam A Presidential Unit Citation is awarded by Richard Nixon in 1970 for Operation Duong Son. It was conducted in the Quế Sơn District in 1970 by the newly created 1st Armored Brigade Headquarters, composed of an Armored Cavalry Squadron, a Regional Force Battalion and 2 Regular Battalions. The 1st Armored Brigade conducted its first mobile independent operations along the sea in the northern part of Military Region 1. Controlling up to two armored cavalry regiments, Rangers, and territorial forces, the brigade roamed over the area for two months and succeeded in destroying three enemy battalions. Almost 900 Viet Cong and PAVN were killed or captured, while the brigade lost sixty-eight men. 37th Ranger Battalion, Army of the Republic of Vietnam This unit earned the single most Presidential Unit Citation of any unit in the war, and was the most decorated of the Ranger Battalion, out of the 11 Battalions in the ARVN Rangers whom had received presidential unit citations. South Vietnamese Army's 37th Ranger Battalion received no less than three United States Army Presidential Unit Citations. The first was awarded in Department of the Army General Order 20 of 1967, for extraordinary heroism in the vicinity of Thach Tru, Quang Ngai Province on November 22, 1965. This was during a battle in which a much larger regiment of the crack 18th NVA Regiment and VC 45th Heavy Weapons Unit had staged a multi-pronged attack and were repulsed. Reinforcing the unit in the battle was a reinforcement of 3rd Battalion, 7th Regiment Marines. The second was awarded in Department of the Army General Order 23 of 1969, for extraordinary heroism in the period of January 27 to February 25, 1968. The third was awarded in Department of the Army General Order 37 of 1973, for extraordinary heroism in the period of February 11 to April 24, 1970. 42nd Ranger Battalion, Army of the Republic of Vietnam A twice-decorated battalion that received Presidential Unit Citation from two different presidents. First decorated in October 1965 with a direct public speech by President Johnson. The Operation involved was a search-and-destroy in which they were on