Commando Helicopter Force
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The Commando Helicopter Force (CHF) is a part of the Fleet Air Arm, and is an element of the Joint Helicopter Command of the British Armed Forces; which provides Rotary-Wing (helicopter) support to 3 Commando Brigade Royal Marines and other elements. The CHF uses a combination of transport helicopters provided by the Royal Navy's Fleet Air Arm based at Royal Naval Air Station Yeovilton in Somerset, England.
The Commando Helicopter Force was formed in 1997 to consolidate command and control of the various Fleet Air Arm and Royal Marines helicopter squadrons which supported 3 Commando Brigade under Flag Officer Naval Aviation.
It is based at Royal Naval Air Station Yeovilton in Somerset, England; although aircraft are regularly deployed with 3 Cdo Brigade, overseas and to the ships of the Amphibious Ready Group; HMS Ocean ( Landing Platform Helicopter), HMS Bulwark and HMS Albion (Landing Platform Docks).
Elements of the force have operated in Northern Ireland until 2002, Sierra Leone in 2000 and Bosnia and it was an element of the amphibious force for Operation Telic, the British involvement in the 2003 invasion of Iraq, notably supporting the landings to secure the Al-Faw Peninsula, as well as being a major part of JHC (Joint Helicopter Command) Operation Herrick, until pulling out in late 2011.
The force supports the 3 Cdo Brigade annual, Cold Weather Warfare exercise in Norway.
In addition to Sea King helicopters, the CHF operated Gazelle AH.1s in utility and reconnaissance roles, as well as Lynx AH.7s in light transport and anti-armour roles. In 2005, the Gazelles were retired, while the Lynxes were replaced with the Lynx Mk9A variant, later.
Command and Control
The CHF is a Fleet Air Arm asset and as such remains under the Operational Command of Fleet Commander, while operational control is delegated to the Joint Helicopter Command, under Army HQ Land Command, who will task assets in accordance with Permanent Joint Headquarters or Joint Forces Command or Front Line Command requirements.
The Commando Helicopter Force has four naval air squadrons with separate roles:
- 845 Naval Air Squadron - Medium-lift - Sea King HC4
- 846 Naval Air Squadron - Medium-lift - Merlin HC3 
- 847 Naval Air Squadron - Light-lift and reconnaissance - Lynx AH.9A
- 848 Naval Air Squadron - Sea King HC4 training unit 
845 Naval Air Squadron operates the Westland Sea King HC Mk.4 helicopter; a variant that has been specially modified for medium-lift and flying in all sorts of weather conditions and terrains. 845 has had at least two of it Sea Kings deployed to the Bosnian theatre since 1992. Besides Bosnia, they have operated in Albania, Egypt, Honduras, Nigeria, and Sierra Leone.
846 Naval Air Squadron operates with 845 NAS, but has not seen action in Bosnia, being more focused on the Northern flank of the Nato theatre. Until recently, 846 maintained a base in Northern Ireland that allowed it to become very proficient in cold weather and winter operations. Their operations are not limited to northern flying conditions, however. The squadron has also operated in South East Asia, Australia, The United States, and Germany. Two Aircraft of 846 were sent to Turkey following the major earthquake it suffered in November 1999. 846 NAS is now temporarily stationed at RAF Benson in Oxfordshire as part of the Merlin transition, due to bring the Merlin Mk3's and Mk3a's back to Yeovilton.
847 Naval Air Squadron operates Westland Lynx AH.9A helicopters, in light transport and reconnaissance roles.
848 Naval Air Squadron is the Commando Sea King HC4 training unit for the group, and trains not only the aircrews but also the ground crews. In addition to the skills necessary to fly their missions, Commando Helicopter Force members are trained in small-arms weapons as well as tactics and survival fieldcraft. Being a naval unit that is directly tasked with supporting the Royal Marines, trainees are also schooled in shipboard and amphibious assault operations. A special unit with 848 Squadron, M Flight, is tasked with supporting the Special Boat Service (SBS) in their operations.
845, 846 and 848 NAS will receive Merlin HC3s/HC3As to replace the retiring Sea King by 2016. The current plan sees 846 NAS equipping with ex-RAF Merlin HC3s in 2015. 845 NAS will follow in 2017, operating the fully navalised Merlin HC4. 847 NAS is upgrading to the AgustaWestland AW159 Wildcat with 4 of them altogether.
Aircrew, recruited from the Fleet Air Arm and Royal Marines, join the force, already trained in helicopter operations, from the Defence Helicopter Flying School at RAF Shawbury. Type training for the Sea King is conducted in 848 Squadron and type training for the Lynx is conducted with the Army Air Corps.
Technician and engineer training is conducted within the single services as appropriate for the aircraft type and supporting trades are filled by qualified single service personnel.
Squadrons conduct organic continuation training and life support and security continuation training is supported from within the force, each squadron maintaining a complement of survival, military skills and cold weather warfare instructors.