| ASP | (or Amm. Sub. Pk) Ammunition Sub-Park |
| AT | Army Troops |
| AVC | Army Veterinary Corps |
| BAC | Brigade Ammunition Column |
| BAPO | Base Army Post Office |
| BC | Battery Commander or Base Commandant |
| Bdmr | Bandmaster |
| BG | Broad Gauge (railway) |
| BGGS | Brigadier-General General Staff |
| BGRA | Brigadier-General Royal Artillery |
| BL | Breech Loading |
| BLC | Breech Loading? Converted |
| BM | Brigade Major |
| BN | Battalion |
| BOMB | Bombardier (Corporal) |
| BOR | British Other Rank |
| BOY | Cabin Boy |
| BRCS | British Red Cross Society |
| BSM | Battery Sergeant-Major |
| BWI | British West Indies Regiment |
| BWM | British War Medal |
| CAPT | Captain |
| CB | Confinement to Barracks (punishment) and Counter-Battery |
| CBSO | Counter-Battery Staff Officer |
| CC | Confined to Camp (punishment) |