In 1965 at Fort Benning, Georgia, the 2nd Infantry Division's stateside units, the 11th Air Assault Division's personnel and equipment, and the colors and unit designations of the 1st Cavalry Division, returned from Korea, were used to form a new formation, the 1st Cavalry Division (Airmobile). The personnel of the existing 1st Cavalry Division in Korea took over the unit designations of the old 2nd Infantry Division. Thus, the 2nd Infantry Division formally returned to Korea in July 1965. From 1966 onwards North Korean forces were engaging in increasing border incursions and infiltration attempts and the 2nd Infantry Division was called upon to help halt these attacks. On 2 November 1966, soldiers of the 1st Battalion, 23d Infantry Regiment were killed in an ambush by North Korean forces. In 1967 enemy attacks in the Korean Demilitarized Zone (DMZ) increased, as a result, 16 American soldiers were killed that year.