Special Operations Aircraft (SOA). 26 converted from CH-47C with similar capabilities as the MH-47D
but with the CH-47SD
(Super-D) increased fuel capacity and upgraded avionics including sophisticated terrain following radar. All assigned to the Nightstalkers
Battalion of the 160th Aviation Regiment (SOAR) at Fort Campbell, Kentucky.
In 1988 the Chinook was equipped with their first air-to-air refueling (AAR) system.
Replaced by the MH-47G
In 1995, the British Royal Air Force ordered eight
of the roughly similar HC.3
. They were delivered in 2001 but never entered operational service due to technical issues with their unique avionics fit. In 2008, work started to downgrade the HC3s to HC2 standard, to enable them to enter service.