On 16 January the battalion was moved by air to Khe Sanh Combat Base unifying the regiment for the first time in the war. Company F occupied Hill 558 3km north of the base while the rest of the battalion occupied a strongpoint on the base's northern perimeter. From 21 January 1968 the 26th Marines were under siege at Khe Sanh until the conclusion of Operation Pegasus on 14 April 1968 and were replaced by the 1st Marines on 15 April 1968 with the battalion flying to Quang Tri Combat Base. In May the battalion was deployed into Operation Kentucky defending Con Thien and other locations in Leatherneck Square. The 26th Marines was transferred from the operational control of the 3rd Marine Division to the 1st Marine Division on 18 May 1968. On 28 July the battalion proceeded to Quang Tri Combat Base to prepare and train for service afloat with Special Landing Force (SLF) Alpha. By 8 August the battalion had embarked onboard ships of Amphibious Ready Group Alpha and on the 13th was redesignated Battalion Landing Team (BLT) 2/26. On 18 August BLT 2/26 relieved 2nd Battalion 1st Marines in the Vietnamese Demilitarized Zone (DMZ). On 13 September BLT 2/26 was landed at Landing Zone Margo replacing the 3rd Battalion 3rd Marines. On 1 October, BLT 2/26 replaced the 1st Battalion 4th Marines in the DMZ. On 16 October BLT 2/26 was flown to Cửa Việt Base. On 19 October SLF Alpha was embarked on ships and landed at Da Nang on 25 October where they conducted Operations Eager Hunter and Garrard Bay. The battalion participated in Operation Meade River from 20 November to 8 December when they reembarked on ships. From 15 December to 5 January 1969 they conducted Operation Valiant Hunt.