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The Online Public Catalog has some entries in RG 338 concerning the first Korean War.
There may be South Korean Army records concerning operations in the 1950's and mid 1960's that have not
been released, since the war is technically not officially ended? There also seems to be a RG 554 referenced toward the Korean War.
NARA RG 338 51-53 Link :
RG 554 POW Link: