In late November 1950, these soldiers were members of the 2nd Battalion, 38th Infantry Regiment, 2nd Infantry Division, then operating south of the Chongchon River in North Korea. Their regiment's positions came under heavy attack by Chinese forces and the 2nd Battalion was forced to withdraw to positions near the town of Kujang. On Nov. 27, Imrie was killed in action, and Trent and Wirrick were reported missing.

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http://military-online.blogspot.com/2007/07/soldiers-missing-in-action-from-korean.html