Beechcraft RC-12 Guardrail

The Beechcraft RC-12 Guardrail was an airborne signals intelligence collection platform built on the Beechcraft King Air and Super King Air airframes. Formally the Guardrail Common Sensor, the United States Army platform began service in 1971 on U-21 aircraft; after the early 1980s the Army adopted the C-12, starting with 13 RC-12Ds converted from C-12Ds, with deliveries from mid-1983. Successive models, the RC-12G, RC-12H, RC-12K, RC-12N, RC-12P and RC-12Q and finally the RC-12X and RC-12X+, added sensors and datalinks and raised the maximum take-off weight; the RC-12H is powered by two Pratt & Whitney Canada PT6A-41 turboprops. The system collected radio and electronic signals, located their sources and passed near-real-time reports to a ground facility, and five RC-12D-like aircraft were sold to Israel. The Army completed the retirement of the programme on 11 December 2025, after the last aircraft flew its final mission in South Korea in July 2025.