The RC-12 aircraft was first used as part of the US Army's Guardrail program. The special electronic mission aircraft (SEMA) used in the Guardrail system were initially based on the U-21 Ute aircraft, until transitioning to the C-12 Huron aircraft as part of the Improved Guardrail V program. The airframe includes navigation, avionics and survivability equipment. RC-12 and RC-12-like aircraft were then used for a wide array of programs requiring SEMA.
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