On 28 December 1967, "Ticonderoga" sailed for her fourth combat deployment to the waters off the Indochinese coast and arrived on Yankee Station in January 1968. "Ticonderoga" was on Yankee Station for the beginning of the 1968 Tet Offensive. Nearly coincidental with the Tet Offensive, the siege of Khe Sanh began and , an American spy ship, was seized by the North Koreans and taken to Wonsan harbor. The aircraft carrier was immediately deployed to the coast of North Korea, beginning Operation Formation Star. Approximately a week later, "Ranger" was relieved off Korea by "Ticonderoga" and returned to Yankee Station. joined "Ticonderoga" and strikes were planned against seven MiG airfields with approximately 200 MiGS. These strikes were never executed and "Ticonderoga" returned to Yankee Station to resume her role in the Tet Offensive. Between January 1968 and July 1968, "Ticonderoga" was on the line off the coast of Vietnam for five separate periods totaling 120 days of combat duty. During that time, her air wing flew just over 13,000 combat sorties against North Vietnamese and Viet Cong forces, most frequently in the continuing attempts to interdict the enemy lines of supply. Between line periods, she regularly returned to Subic Bay and Naval Air Station Cubi Point for rest and replenishment. She also made port visits at Singapore and Hong Kong. On 9 July, during her fifth line period, LCDR John B. Nichols claimed "Ticonderoga"s first MiG kill. The carrier completed that line period and entered Subic Bay for upkeep on 25 July. "Ticonderoga" then proceeded for her homeport in Naval Air Station North Island, Coronado, California arriving on 17 August 1968 after a one-day delay in the fog off San Diego in the San Clemente Channel. Shortly thereafter, "Ticonderoga" moved to the Long Beach Naval Shipyard for repairs and certain conversions to handle the A-7 Corsair attack jet and to prepare for her fifth combat cruise in February 1969.