In April 1964, the situation in Indochina led to orders for the PACAF 41st Air Division B-57B Canberra 8th and 13th Bombardment Squadrons to be reassigned from rotational nuclear "quick strike" alert in South Korea to Thirteenth Air Force at Clark AB for possible tactical bombardment missions against communist aggressor forces in South Vietnam. On 9 April 1965, the first Canberras of the 13th Bomb Squadron began arriving at Clark; the 8th began arriving on 17 April. By the end of the month all 47 of the former 3d Bomb Wing's aircraft arrived in the Philippines. The squadrons were formally assigned to Headquarters 13th Air Force, however they were attached to the 405th Wing for administrative and logistical support.