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| August 1914 | Foreign Legion or American Ambulance? |
| April 1915 | With the French Army Automobile Service. |
| April 1916 | With the Lafayette Escadrille |
| July 1916 | A new home for the Field Service. |
| April 1917 | The Field Service becomes a combattant. |
| Fall, 1917 | Absorbed into the United States Army Ambulance Service. |