Chester T. O'Brien, hull DE-421, belonged to the John C. Butler class of destroyer escorts. Brown Shipbuilding, at Houston, Texas, laid her down on 21 January 1944 and launched her on 29 February 1944. The Navy commissioned her on 3 July 1944. Her first commanding officer was Lieutenant Commander Richard Daniel White.
Her Pacific duty took her to Hollandia, Mindanao, and Zamboanga.
Her commissioned service ended on 25 May 1960. She went to the breakers later.
