| Dossier(s) d’engagement | Federated | Nom | Prénom | Date de naissance | Lieu de naissance |
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| O'Brien | Albert Peter | 1897-04-04 | Pineville, NB |
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| O'Brien | Alfred Patrick | 1896-04-26 | Saint John, NB |
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| O'Brien | Andrew | 1882-09-12 | Petitcodiac, NB |
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| O'Brien | Arthur Chesley | 1894-08-20 | Nixon, NB |
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| O'Brien | Arthur James | 1891-07-06 | Milltown, NB |
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| O'Brien | Avard | 1891-04-09 | -- |
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| O'Brien | Benjamin | 1892-06-26 | Loggieville, NB |
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| O'Brien | Bertie | 1900-06-06 | -- |
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| O'Brien | Charles Arthur | 1888-11-16 | Fredericton, NB |
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| O'Brien | David Lawrence | 1896-11-24 | Springhill, NS |
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| O'Brien | Edward Patrick | 1901-01-27 | Saint John, NB |
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| O'Brien | Felixe | 1891-06-22 | Midgic, NB |
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| O'Brien | Francis "Frank" Leo | 1899-04-13 | Saint John, NB |
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| O'Brien | Frederick Charles | 1894-03-27 | Saint John, NB |
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| O'Brien | Frederick Jerrad | 1898-07-01 | Saint John, NB |
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| O'Brien | George A. | 1887-08-03 | Saint John, NB |
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| O'Brien | George Caldridge | 1884-10-01 | Elgin, NB |
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| O'Brien | George M. | 1876-12-09 | Little River, NB |
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| O'Brien | Harold Ross | 1897-06-07 | Moncton, NB |
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| O'Brien | James Alexander | 1898-03-06 | Moncton, NB |
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| O'Brien | James Edward | 1897-02-04 | Tabusintac, NB |
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| O'Brien | James Joseph | 1895-12-18 | Saint John, NB |
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| O'Brien | James Thomas | 1871-02-09 | Manchester, England |
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| O'Brien | John | 1886-04-16 | River Louison, NB |
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| O'Brien | John | 1888-03-22 | Saint John, NB |
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| O'Brien | John | 1891-06-20 | -- |
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| O'Brien | John Charles | 1888-09-22 | Saint John, NB |
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| O'Brien | John Francis | 1893-03-28 | Saint John, NB |
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| O'Brien | John Hazen | 1896-05-20 | -- |
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| O'Brien | John James | 1880-06-22 | County Galway, Ireland |
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| O'Brien | John James | 1893-01-15 | Saint John, NB |
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| O'Brien | John Matthew | 1888-10-27 | -- |
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| O'Brien | John Patrick | 1874-03-17 | Saint John, NB |
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| O'Brien | John Patrick | 1895-12-05 | Saint John, NB |
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| O'Brien | John Vincent | 1893-09-04 | Moncton, NB |
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| O'Brien | Joseph | 1891-05-27 | Canton, ME |
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| O'Brien | Joseph | 1893-10-20 | Amherst, NS |
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| O'Brien | Joseph Arthur | 1897-08-22 | -- |
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| O'Brien | Joseph Leonard | 1895-11-06 | South Nelson, NB |
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| O'Brien | Joseph Patrick | 1870-03-12 | Saint John, NB |
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| O'Brien | Kitchener Herbert | 1896-08-22 | East Mapleland, NS |
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| O'Brien | Lawney Daniel | 1897-03-27 | -- |
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| O'Brien | Maurice | -- | -- |
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| O'Brien | Michael | 1896-04-23 | Newcastle, NB |
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| O'Brien | Michael Gerald | 1893-08-01 | Halifax, NS |
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| O'Brien | Michael Joseph | 1894-05-25 | Saint John, NB |
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| O'Brien | Patrick Charles | 1900-03-17 | Saint John, NB |
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| O'Brien | Peter | 1879-06-27 | Cappoquin, Ireland |
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| O'Brien | Peter Sorden | 1880-10 | O'Leary, PE |
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| O'Brien | Rensford George | 1892-07-04 | -- |