In late December 1972, the 13th Bombardment Squadron returned to the 405th from the 8th Tactical Fighter Wing at Ubon RTAFB, Thailand with B-57G Canberras, which were B-57B that had been returned to Martin in 1969 and modified as night intruders for use in Vietnam in September 1970 under a project known as Tropic Moon. The B-57s, however were transferred almost immediately back to the United States and assigned to the 190th Bombardment Group (Tactical) of the Kansas Air National Guard at Forbes AFB. The 13th Bomb Squadron remained assigned to the wing as an administrative unit until it was inactivated on 30 September 1973.