| Breen | J | | | 1st Battalion. Attached 18th MI
Source: QSA and KSA medal rolls | (Duke of Albany's Ross-shire Buffs) Seaforth Highl |
| Breen | J | | | 2nd Battalion
Source: Medal rolls | Royal Munster Fusiliers |
| Breen | J | | | 1st Battalion
Source: QSA and KSA medal rolls | Royal Inniskilling Fusiliers |
| Breen | J C | 2456 | Trooper | Discharged 25 Feb 02 time expired
Source: Nominal roll in WO127 | South African Light Horse |
| Breen | J J | | Trooper | Natal 1906 (1)
Source: Recipients of the Natal 1906 Medal | Royston's Horse |
| Breen | J J | | | Source: QSA and KSA rolls | DEOVR |
| Breen | J T | | | Source: WO100/281 | Jansenville DMT |
| Breen | John | 75 | Private | Source: OZ-Boer database | Victoria, 1st Victorian Contingent |
| Breen | John | 709 | Private | Source: OZ-Boer database | Victoria, 2nd Battalion Australian Commonwealth Ho |
| Breen | John J | | | B Division
Source: QSA and KSA medal rolls | South African Constabulary |
| Breen | John Thomas | 21587 | Trooper | Source: Nominal roll in WO127 | Marshall's Horse |
| Breen | Joseph | 446 | | Source: OZ-Boer database | Victoria contingent |
| Breen | Joseph | 31555 | Trooper | Served 15 Feb 01 to 21 May 01. Discharged M/U C.T.
Source: Nominal roll in WO127 | Scottish Horse |
| Breen | Joseph | 31555 | Trooper | 2nd Battalion
Source: QSA Medal Rolls | Scottish Horse |
| Breen | L | 3283 | Private | 2nd Battalion
Source: QSA roll | Lancashire Fusiliers |
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