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100th Regiment Royal Artillery


100 (Yeomanry) Regiment Royal Artillery (Formerly NRHQ RA). 

We are based in Woolwich, the spiritual home of the Royal Artillery, with 221 (Wessex) Bty located in Larkhill, 255 (Somerset Yeomanry) Bty in Bath and an All Arms Staff Pool supporting Defence.

We provide a range of capabilities from Tactical Air Control Parties and Naval Gunnery Liaison Officers to specialist Staff Officers and Gunnery Instructors.

Our personnel spend most of their time supporting the Regular Army, Navy and Air Force on exercise and operations at home and abroad.

Facts and Figures


Active From




Tactical Air Control, Gunnery Instruction, Specialist Staff Officers and Naval Gunfire Liaison

Our Locations

221 Bty RA (Gunnery Staff) Training Ukrainians At Larkhill 2 (1)

221 (Wessex) Battery

221 Battery provides specialist gunnery staff support across the Field Army, but principally to Regular and Reserve Royal Artillery units and the Royal School of Artillery.​

Email [email protected] to find out more.

255 Bty Gila Bend 2022

255 (Somerset Yeomanry) Battery

255 (SY) Battery provides Tactical Air Control Parties (TACPs), consisting of Joint Terminal Attack Controllers (JTACs) and TACP Signallers to support ground forces in the control of Close Air Support (CAS) aircraft; personnel deploy either as formed TACPs or as individual augmentees.  

The Battery has a cohort of experienced JTAC Instructors/Evaluators that routinely organise and deliver complex CAS training for Defence and NATO partners.

Email [email protected] to find out more.


AASP On Ex Steel Dragon 2022 Ops Room 2 (1)

All Arms Staff Pool

The All Arms Staff Pool (AASP) provides individual replacements to support staff officer functionality in Field Army formation Headquarters.

The AASP also includes The Kings’ Troop Royal Horse Artillery support troop and Naval Gunfire Liaison Officers (NGLO’s). NGLO’s deploy on Royal Navy and partner-nation warships to work with 29 Commando Regiment Royal Artillery and enable naval gunnery.

Email [email protected] to find out more.