Force secured lines of communication and fire support bases (FSB). Extensive RIF operations were conducted as well. Operation Manhattan Commencing on 23 April 1967 the third operation titled Operation Manhattan was a thrust into the Long Nguyen Secret Zone by the 1st and 2nd Squadrons. This zone was a long-suspected regional headquarters of the Viet Cong. In a series of reconnaissance in force operations 60 tunnel complexes were uncovered. 1884 fortifications were destroyed. 621 tons of rice was evacuated during these operations. Operation Manhattan ended on 11 May 1967. Operation Kittyhawk Beginning in April 1967 and running through 21 March 1968, the regiment was tasked to secure and pacify Long Khánh District. This year-long mission was called Operation Kittyhawk. It achieved three objectives: Viet Cong (VC) were kept from interfering with travel on the main roads, Vietnamese were provided medical treatment in civic action programs like MEDCAP and DENTCAP and finally, RIF operations were employed to keep the VC off balance, making it impossible for them to mount offensive operations. 1967 From the summer of 1967 until the winter the regiment was led by Col. Roy W. Farley. Operation Emporia I & II was a road clearing operation with limited RIF missions by the 1st and 3rd Squadrons in Long Khánh District. Operation Valdosta I & II was a regimental size operation. Its purpose was to provide security at polling places during elections and to maintain reaction forces to counter VC agitation. As a result of the operation 84.7% of eligible voters cast ballots in Long Khánh District in the first general election and 78% in the second. Operation Quicksilver Operation Quicksilver involved the 1st and 2nd Squadrons of the 11th Armored Cavalry. Its purpose was to secure routes that moved logistical personnel of the 101st Airborne Division between Binh Long and Tây Ninh Provinces. Cordon, search and RIF missions were also performed. Operation Fargo Operation Fargo ran from 21 December 1967 until 21 January 1968. This regimental size operation conducted RIFs in Binh Long and Tây Ninh Provinces and opened Route 13 to military traffic for the very first time. The Tet Offensive The early part of 1968 was marked by the most ambitious and embolden offensive attack coordinated by the VC and NVA in the history of the war. The Tet Offensive was designed to coincide with the Vietnamese New Year. Operation Adairsville Operation Adairsville began on 31