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However, one version of the Gulfstream IV that is rarely seen is the USAF C-20C, which isn't listed in anywhere and is part of a classified programme. Three C-20C aircraft (85-0050 c/n 456, 85-0049 c/n 473 and 86-0403 c/n 473) are based at Andrews AFB in Maryland and are operated by the Presidential Airlift Group (PAG) of the 89th Airlift Wing. The C-20C aircraft are part of a secret programme known as COOP (Continuity Of government Operations Programme) and are used to transport the President and other VVIPs in the event of a national emergency. The three C-20C aircraft are equipped with a comprehensive communication system installed by E-Systems and designed to enable operations in a post-nuclear environment. As part of this rol, whenever the US President or another VVIP travels anywhere in Air Force One, a C-20C is usually positioned discretely at an adjacent airfield, just in case the President or VVIP has to suddenly depart in a hurry and Air Force One has been disabled.
