C-20B - United States Air Force and United States Coast Guard variant with upgraded electronics, used for Operational Support Airlift (OSA) and Special Assignment Airlift Missions (SAAM); the single Coast Guard C-20B was used by the Commandant of the Coast Guard and other senior USCG officials as well as the Secretary of Homeland Security.
C-20B - United States Air Force og United States Coast Guard variant med opgraderet elektronik, benyttet til Operational Support Airlift (OSA) og Special Assignment Airlift Missions (SAAM); den enlige Coast Guard C-20B blev benyttet af Kommandanten af Coast Guard og andre højtstående USCG tjenestemænd, så vel som af USA's Secretary of Homeland Security.