R
- RA – Royal Artillery
- RAAM – Rifle-launched Anti-Armour Munition
- RAAMS – Remote Anti-Armor Mine System (US)
- PABD – Pay Entry Base Date
- RAC – Royal Armoured Corps
- RADIRS – Rapid Deployment Multiple Rocket System (US)
- RAAF – Royal Australian Air Force
- RAE – Royal Aircraft Establishment, Royal Aircraft Establishment (Farnborough)
- RAE – Royal Australian Engineers, Australian Combat Engineers
- RAF – Royal Air Force
- RAM-D – reliability, availability, maintainability and durability
- RAN – Royal Australian Navy
- RAO – Rear Area Operations
- RAP – rocket-assisted projectile
- RAPI – Reactive Armour Protection
- RARDE – Royal Armament Research and Development Establishment (UK)
- RATAC – Radar de Tir pour L'Artillerie de Campagne (radar for field artillery fire)
- RATELO – Radio Telephone Operator
- RAW – Rifleman's Assault Weapon
- RBL – Range and Bearing Launch
- RC/MAS – Reserve Component/Modified Armament System
- RCAAS – Remote-Controlled Anti-Armor System (US)
- RCAF – Royal Canadian Air Force
- RCC – ROLAND Coordination Center (US)
- RCDU – Remote-Controlled Defence Unit
- RCL – Recoilless rifle
- RCN – Royal Canadian Navy
- RCS – Radar Cross Section
- RCT – Regimental Combat Team
- RCT – Royal Corps of Transport
- RCV – Robotic Command Vehicle
- RDF – Rapid Deployment Forces
- RDF/LT – Rapid Deployment Force Light Tank (US)
- RDJTF – Rapid Deployment Joint Task Force (US)
- RDT&E – Research Development Test and Evaluation
- REME – Royal Electrical and Mechanical Engineers
- RF – Rimfire
- RFA – Royal Field Artillery
- RFAS – Russian Federation and Associated States
- RFC – Royal Flying Corps
- RFI – request for information
- RFP – request for proposals
- RFPI – Rapid Force Projection Initiative
- RFQ – Request For Quotations
- RGGS – Rifle Grenade General Service
- RHA – rolled homogeneous armour
- RHA – Royal Horse Artillery
- RIN – the former Royal Indian Navy
- RIS – Rail Interface System
- RISE – Reliability Improved Selected Equipment
- RLC – Royal Logistic Corps
- RLEM – Rifle-Launched Entry Munition
- RLG – Ring Laser Gyro
- RLT – Regimental Landing Team
- RMG – ranging machine gun
- RN – Royal Navy
- RNZAF – Royal New Zealand Air Force
- RNZN – Royal New Zealand Navy
- RO – Royal Ordnance
- ROBAT – Robotic Counter-Obstacle Vehicle (US)
- RoC – Republic of China
- ROC – required operational characteristics
- ROE – Rules Of Engagement
- ROF – Royal Ordnance Factory (UK)
- ROF – Rate Of Fire
- RoK – Republic of Korea
- RoKMC – Republic of Korea Marine Corps
- RoKIT – Republic of Korea Indigenous Tank
- ROR – range only radar
- ROTA – Royal Ordnance Training Ammunition
- RP – Red phosphorus
- RP – rocket-propelled
- RPC – Rocket Pod Container
- RPG – Rocket-propelled grenade
- RPG – Ruchnoy Protivotankovy Granatomyot
- RPV – Remotely piloted vehicle
- RR – Recoilless rifle
- RRPR – Reduced Range Practice Rocket
- RRTR – Reduced Range Training Round
- RSAF – Royal Small Arms Factory (UK) (now closed)
- RSS – Rosette Scanning Seeker
- RTE – Rifle Team Equipment
- RTT – Roues Transporteur de Troupes
- RUC – Royal Ulster Constabulary
- RWS – Remote weapon system (or station)
Read more about this topic: Glossary Of Military Abbreviations