From 1946 until 1950, the 728th remained stateside where its mission was focused on maintaining domestic security in various areas in the United States. Soon thereafter the battalion was transferred to Yokohama, Japan. When North Korea invaded South Korea and the United States began their intervention the 728th was reassembled in Pusan, South Korea. Their new mission was operation and maintaining traffic on the Green Diamond Main Supply Route (MSR). During the next eight months, many soldiers of the unit took active part in combat to suppress guerrilla activities and respond to ever changing battles. At some point after the "MacArthur Invasion" the battalion headquarters was transferred to Incheon, South Korea. As security conditions in the Korean theater improved the battalion headquarters was again transferred, this time to Seoul. In 1951 the Battalion began assisting in traffic control and other civil law enforcement duties. The unit was a major participant in the Korean War until the signing of the in 1953.