Shorts—C-23 Sherpa: USAF Variants and Serials C-23A: Eighteen C-23As were obtained to conduct the delivery of urgent cargo and spare parts in Europe, although they were withdrawn and flown to the USA for service with the Air Force, Army and Forestry Service. · 83-0512 to 83-0513; 84-0458 to 84-0473 (Note: only 83-0512, 83-0513 and 84-0458 remain on USAF charge, as the remaining 15 were transferred to the US Army and US Forestry Service during 1990.)