16 Air Assault Brigade Combat Team, known simply as 16 Air Assault Brigade from 1999 – 2021, is a formation of the British Army predominantly based in Colchester, Essex. It makes up the Air Assault Task Force, a battlegroup held at high readiness, and is the only brigade in the British Army focused on operating via parachute, helicopter and air-landing.
The Royal Horse Artillery (RHA) was formed in 1793 as a distinct arm of the Royal Regiment of Artillery to provide horse artillery support to the cavalry units of the British Army. Although the cavalry link remained part of its defining character, as early as the Battle of Waterloo the RHA was sometimes deployed more along the lines of conventional field artillery, fighting from comparatively fixed positions.
Colchester Garrison is a major garrison located in Colchester in the county of Essex, eastern England. It has been an important military base since the Roman era. The first permanent military garrison in Colchester was established by Legio XX Valeria Victrix in AD 43, following the Roman conquest of Britain. Colchester was an important garrison town during the Napoleonic Wars and throughout the Victorian era. During the First World War, several battalions of Kitchener's Army were trained there.
The 4th Regiment Royal Artillery is a regiment of the Royal Artillery in the British Army. It was formed in 1939 as 4th Regiment Royal Horse Artillery, before being redesignated in 1961.
3rd Regiment Royal Horse Artillery is a regiment of the Royal Horse Artillery in the British Army. They are currently based at Albemarle Barracks, Northumberland, England.
1st Regiment Royal Horse Artillery is a regiment of the Royal Horse Artillery in the British Army. It currently serves in the armoured field artillery role, and is equipped with the AS90 self-propelled gun. The regiment is currently based at Larkhill Garrison, Larkhill. The regiment completed its move from Assaye Barracks, Tidworth, to Larkhill in June 2019.
5th Regiment Royal Artillery is a regiment of the Royal Artillery in the British Army. It was formed in 1939 as 5th Regiment Royal Horse Artillery before being redesignated in 1958. It currently serves in the Surveillance and Target Acquisition role and is equipped with radars and acoustic sound ranging equipment; it also provides Special Observation Post teams.
7th Parachute Regiment, Royal Horse Artillery is a regiment of the Royal Artillery in the British Army. It currently serves in the field artillery role with 16 Air Assault Brigade Combat Team, and is equipped with the L118 Light Gun.
This is the Operation Herrick ground order of battle, which lists any British ground forces that have taken part in the duration of Operation Herrick between 2002 and 2014.
B Battery, Royal Horse Artillery is a Close Support Battery of 1st Regiment Royal Horse Artillery. It is currently based in Purvis Lines in Larkhill Camp.
E Battery Royal Horse Artillery is a Close Support Battery of 1st Regiment Royal Horse Artillery. It is currently based in Purvis Lines in Larkhill Camp.
L (Néry) Battery Royal Horse Artillery is the Tactical Group Battery of 1st Regiment Royal Horse Artillery.
Z Battery RA was a Battery of 5th Regiment Royal Artillery in the Royal Artillery. It had the Surveillance and Target Acquisition role and was equipped with various weapon platform locating equipment using radars and acoustic sound ranging assets.
F (Sphinx) Parachute Battery Royal Horse Artillery is a close support battery of 7th Parachute Regiment Royal Horse Artillery, part of the Royal Horse Artillery of the British Army, currently based in Merville Barracks in Colchester.
VII Brigade, Royal Horse Artillery was a brigade of the Royal Horse Artillery which existed in the early part of the 20th century. It served with 1st Cavalry Division throughout World War I and was reorganized post-war before being dissolved. A related unit 7th Regiment, RHA had a brief existence post-World War II, before 7th Parachute Regiment, RHA was formed in 1961.
2nd Regiment Royal Horse Artillery was a regiment of the Royal Horse Artillery that served in the Second World War. It saw action in France, Greece, North Africa and Italy. It was redesignated as 2nd Field Regiment, Royal Artillery in 1958.
G Parachute Battery Royal Horse Artillery is a close support battery of 7th Parachute Regiment Royal Horse Artillery, part of the Royal Horse Artillery of the British Army, currently based in Merville Barracks in Colchester.
I Parachute Battery Royal Horse Artillery is the Headquarters battery of 7th Parachute Regiment Royal Horse Artillery, part of the Royal Horse Artillery of the British Army, currently based in Albemarle Barracks in Newcastle Upon Tyne.
H Battery Royal Horse Artillery is a battery of 1st Regiment Royal Horse Artillery, part of the Royal Horse Artillery of the British Army. As of 2015, it is based at Albemarle Barracks, Northumberland, England and is equipped with GMLRS.
V Battery Royal Horse Artillery was a battery of the Royal Horse Artillery. Formed in 1804, the battery took part in the Napoleonic Wars – notably the Peninsular War and Battle of Waterloo – before being placed into suspended animation in 1816 as part of the usual post-war reductions of the British Army.
United Kingdom 
Hon East India Coy (till 1858)
British Army 