Gulfstream IV

===C-20F/G/H/J military variants===
[[File:Gulfstream Aerospace C-20F Gulfstream IV (G-IV), USA - Army AN1831074.jpg|thumb|[[U.S. Army]] C-20F]]

The U.S. military variant of the IV, designated ''C-20F/G/H/J Gulfstream IV'' in [[United States Department of Defense|Department of Defense]] service.<ref name="DoD 4120L">[https://web.archive.org/web/20070930200603/http://www.dtic.mil/whs/directives/corres/pdf/412015l.pdf  DoD 4120-15L, ''Model Designation of Military Aerospace Vehicles'']. US DoD, 12 May 2004.</ref>  The ''C-20F'' is a GIV model operated by the [[U.S. Army]] in a command/executive transport role.

The ''C-20G'' aircraft<ref>{{Cite web|url=https://www.airliners.net/photo/USA-Navy/Gulfstream-Aerospace-C-20G-Gulfstream-IV-G-IV/606801|title=Aviation Photo #0606801: Gulfstream Aerospace C-20G Gulfstream IV (G-IV) - USA - Navy|website=Airliners.net}}</ref> may be configured for cargo operations, 26 passenger operations or combinations of the two. With passengers seats removed, it may be configured as three pallets with no passengers or two pallets and eight passengers or one pallet and fourteen passengers. With full seating, the aircraft is capable of accommodating up to twenty-six passengers and a crew of four. A hydraulically operated cargo door is installed on the starboard side of the aircraft, and a ball roller cargo floor is capable of accommodating [[palletized cargo]].  The C-20G was operated by Fleet Logistics Support Squadron Four Eight (VR-48) at [[Naval air station#United States Navy|Naval Air Facility]], [[Andrews Air Force Base]], Maryland before its 2012 deactivation. It is operated by VMR Detachment Kaneohe Bay, [[Marine Corps Air Station Kaneohe Bay]], [[Marine Corps Base Hawaii]].<ref>Wings of Gold, Vol. 36, No. 3, Fall 2011, Association of Naval Aviation, Alexandria, VA, pp.18-21</ref> The C-20G is also known as the "Grey Ghost"<ref>[http://www.pearlharborvisitorcenter.com/archives/The_Grey_Ghost.html The Grey Ghost] {{webarchive|url=https://web.archive.org/web/20110704105551/http://www.pearlharborvisitorcenter.com/archives/The_Grey_Ghost.html |date=2011-07-04 }} Hawaii Reporter: Dispatches from the War on Terrorism, September 24, 2004</ref>

The ''C-20H'' is a GIV-SP model operated by the [[U.S. Air Force]] in a command/executive transport role.  The ''C-20J'' is a GIV-SP model operated by the U.S. Army in a command/executive transport role.

The [[United States Department of Defense]] C-20A/B/C/D/E aircraft are all [[Gulfstream III]] variants.