As the phase-down of testing activities continued during the moratorium, in August 1961 the 4950th Test Group (Nuclear) and 4925th Test Group (Atomic) were disestablished. Also during this moratorium period most of the missions of the AFSWC's 4926th Test Squadron (Sampling) consisted of U.S. Weather Bureau projects. On 16 August 1961 the 4926th Test Squadron (Sampling) was placed under HQ, 9th Weather Reconnaissance Group, Air Weather Service of the Military Air Transport Service (MATS), since MATS also used the RB-57D Canberra aircraft and could easily add the unit to their inventory (Jones et al. 1976). The new unit designation was the 1211th Test Squadron (Sampling). Although the unit was no longer under AFSC, it remained based out of Kirtland.