O’Brien earned six bronze service star during World War II: one on her European-African-Middle Eastern Campaign Ribbon and five on her Asiatic-Pacific Campaign Ribbon as follows:

1 Star	INVASION OF NORMANDY 6–25 June 1944.
1 Star	LEYTE OPERATION Luzon attack: 13–19 November 1944. Ormoc Bay landings: 7–8 December 1944.
1 Star	LUZON OPERATION Mindoro landings, 12–18 December 1944.
1 Star	IWO JIMA OPERATION Fifth Fleet raids against Honshu and Nansei Shoto: 4 January–1 March 1945. Assault and occupation of Iwo Jima: 15 February–1 March 1945.
1 Star	OKINAWA OPERATION Assault and occupation of Okinawa: 25 March–1 April 1945.
1 Star	CONSOLIDATION OF SOUTHERN PHILIPPINES Mindoro Island landings 20 July 1945.

O’Brien earned five bronze service stars on her Korean Service Ribbon as follows:

1 Star	FIRST U.S. COUNTER OFFENSIVE 1951 9 March–7 April 19512.
1 Star	COMMUNIST CHINA SPRING OFFENSIVE 1951 13 May–27 June 1951.
1 Star	U.N. SUMMER-FALL OFFENSIVE 1951 11 July–21 September 1951.
1 Star	KOREAN DEFENSE, SUMMER-FALL 1952 23 July–25 October 1952.
1 Star	THIRD KOREAN WINTER, 1952–53 10–22 December 1952.

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