Royal Monmouthshire Royal Engineers (Militia) is the senior reserve regiment of the British Army and takes precedence immediately after the Regular Forces and before all other units of the Territorial Army. 

70 Squadron RAF is based at RAF Lyneham, Wiltshire and is equipped with the latest Hercules transport aircraft. They fly missions around the world, transporting logistical supplies to the Army and the Royal Navy within the Theatre of Operations. 

19(F) Squadron is the Royal Air Force's sole Fast Jet Tactical Weapons Training Squadron, responsible for teaching all RAF and RN fast jet pilots of the future.  They are currently tasked is to train 40 RAF and 5 RN/RM ab-initio pilots each year, with an additional task of 25 Indian Air Force pilots per year until May 2008.

Monmouth Borough was created as a district council in 1974 as a result of a re-organisation of local government. It covers about 300 square miles of rural east Gwent and takes in a large part of the Wye Valley Area of Outstanding Natural Beauty and part of the Brecon Beacons National Park. 

Monmouth Town is a particularly attractive ancient market and border town situated at the confluence of the rivers Wye, Monnow and Trothy. The town was founded shortly after the Norman invasion in 1066 and is a blend of Georgian and Tudor buildings. 

Monmouth School is an independent school based in the town of Monmouth. It was founded in 1616 during the reign of James I. 

The Royal Naval Association (RNA) is an organisation formed of former Royal Naval personnel and their close families. Their 500 branches around the world provide a focal point for strong contacts between the RN and the community as well as providing invaluable support to service charities. They are also able to provide support and resettlement advice to retiring RN personnel. HMS Monmouth is affiliated to Monmouth Royal Naval Association. 

The Queen's Dragoon Guards are the Welsh Cavalry unit. They are equipped with the Scimitar Armoured Scout Vehicle and spearhead the Army's Rapid Reaction Force. 

The Worshipful Company of Drapers: From its origins as a City of London medieval guild involved in the woollen cloth trade, the modern role of the Drapers' Company is the administration of several charitable trusts relating to relief of need, education and the elderly. In its Hall in the City it also provides a successful banqueting and catering service. From its medieval responsibility of providing arms and men to the Crown when called upon, the Company maintains links with the armed forces to this day. 

Royal Observer Corps Association: HMS Monmouth is affiliated to the Cardiff and Newport Branch of the Royal Observer Corps Association. The Royal Observer Corps can trace its roots back to the Armada threat of 1588 when trained volunteers were posted on English shores to warn of any impending Spanish invasion. The Corps was stood down in 1991, but its spirit lives on in the Association. 

The Combined Cadet Force (CCF) and Sea Cadet Corps (SCC) are independent youth organisations with a strong emphasis on developing military virtues within their members. They have strong links with the armed forces which provide training support and facilities. HMS Monmouth is affiliated to the following units: TS Tenby (SCC), TS Avon (SCC-Bath) and Haberdashers Aske CCF.