The Oxford Companion to American Military History
- Race in the Military
- Race Relations and War
- RADAR
- Radford, Arthur
- Radio and Television Service, Armed Forces
- Randolph, A. Philip
- Rangers, U.S. Army
- Rank and Hierarchy
- Rankin, Jeannette
- Rape by Military Personnel
- Reagan, Ronald
- Reconstruction
- Recruitment
- Red Cloud
- Red Cross, American
- Reed, Walter
- Reenactments, Military
- Reference Books on War, Peace, and the Military
- Regionalism and the Military
- Religion and War
- Religion in the Military
- Reserve Associations
- Reserve Forces Act (1955)
- Reserve Officer Training Corps
- Revenue Cutter Service
- Revolutionary War (1775–83)
- Revolvers
- Rickenbacker, Eddie
- Rickover, Hyman G.
- Ridgway, Matthew B.
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