| Name | Unit |
|---|---|
| O'FARRELL, Rufus E. Jr. (KIA) | Company B, 1st Battalion, 135th Infantry Regiment, 34th Infantry Division |
| O'FLAHERTY, Rev. Colman E. (KIA) | Attached to the 28th Infantry Regiment, First Division (Regular Army) |
| O'HAGAN, Thomas P. (WIA) | Company C, 165th Infantry Regiment, 42nd Division |
| O'KEEFE, Arthur J. (WIA) | Company H, 18th Infantry Regiment, First Division (Regular Army) |
| O'KEEFE, Arthur J. (WIA) | Company G, 2nd Battalion, 18th Infantry Regiment, 1st Infantry Division |
| O'KEEFE, Daniel J. | Company B, 361st Infantry Regiment, 91st Division |
| O'KEEFE, John J. | Company M, 131st Infantry Regiment, 33rd Division |
| O'KEEFE, Thomas J. (KIA) | Company H, 26th Infantry Regiment, First Division (Regular Army) |
| O'KELLEY, Edward Barber (WIA) | Headquarters Company, 902nd Field Artillery Battalion, 77th Infantry Division |
| O'KELLEY, Grover Cleveland | 80th Company, 6th Regiment (USMC), 2nd Division (U.S. Army) |
| O'KELLY, Thomas (WIA) | Company C, 165th Infantry Regiment, 42nd Division |
| O'KUSKY, Henry Joseph, Jr. (KIA) | Company A, 5th Battalion, 7th Cavalry, 3rd Brigade, 1st Cavalry Division (Airmobile) |
| O'LEARY, Eugene Bernard (WIA) | B-17 Gunner; 419th Bombardment Squadron, 301st Bombardment Group (H), 15th Air Force |
| O'LEARY, Joseph A. (KIA) | Battery F, 124th Field Artillery, 33rd Division |
| O'MALLEY, George Patrick, MD | Attached to the 7th Sussex Regiment, British Expeditionary Force |
| O'MARA, Leo E. (WIA) | 13th Infantry Regiment, 8th Infantry Division |
| O'NEAL, James Allen (WIA) | B-24 Flight Engineer/Gunner; 719th Bombardment Squadron, 449th Bombardment Group (H), 15th Air Force |
| O'NEAL, James Lee | Company L, 7th Infantry Regiment, 3rd Division |
| O'NEIL, Frank P. | 101st Infantry Regiment, 26th Division |
| O'NEIL, John DeWitte (KIA) | Company E, 2nd Battalion, 179th Infantry Regiment, 45th Infantry Division |
Description