 Most of this activity was centered on nuclear tests carried out in People's Republic of China, but monitoring air in the aftermath of U.S. underground nuclear tests was also conducted.One RB-57F is known to have been used for research into airborne laser equipment by the Air Force Logistics Command research laboratory at Kirtland AFB.In 1968, the Air Weather Service's RB-57Fs were redesignated WB-57F.