James Rowan O'Beirne
George Herman O'Brien Jnr
Henry D O'Brien
Oliver Albert O'Brien
Peter O'Brien
William Joseph O'Brien
John O'Callaghan
Joseph Timothy O'Callahan
Thomas O'Connell
James Francis O'Conner
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Albert O'Connor
Timothy O'Connor
John O'Dea
Menomen O'Donnell
Timothy O'Donoghue
Edward Henry "Butch" O'Hare
Richard Hetherington O'Kane
Robert Emmett O'Malley
(Living Recipient)
John O'Neal
Richard William O'Neill
Stephen O'Neill
William O'Neill
Michael O'Regan
Thomas E O'Shea
John Francis O'Sullivan
William Oakley
Eugene Arnold Obregon
Carlos Carnes Ogden Snr
Allan Masaharu Ohata
August Ohmsen
James Kazuo Okubo
Yukio Okutso
Milton Lee Olive III
Charles Oliver
Francis Oliver
Paul Ambrose Oliver
Anton Olsen
Arlo Laverne Olson
Kenneth Lee Olson
Truman O Olson
Frank H Ono
John N Opel
David Orbansky
Nicholas Oresko
Francis Edward Ormsbee Jnr
Harry Westley Orndoff
Charles Alvin Orr
Moses Orr
Robert Levan Orr
John Ortega
Jacob George Orth
John Osborne
Weedon Edward Osborne
William Henry Osborne
Wiliam Osborne
Christian Osepins
Albert Oss
Edward Albert Ostermann
Kazuo Otani
David George Ouellet
Joseph R Ouellette
Jacob H Overturf
Miles Mason Oviatt
Michael Owens
Robert Allen Owens
Joseph William Ozbourn