After the outbreak of the Korean War, "Seer" was ordered reactivated. Recommissioned on 8 November 1950, she joined MinDiv 8 and for the remainder of the war performed training and schoolship duties out of Charleston, South Carolina, conducting periodic tours at Mayport and Panama City, Florida. In January 1954, she returned to the Mediterranean for a four-month tour with the 6th Fleet. At the end of May, she returned to Charleston to resume operations from that port and from Panama City. On 6 January 1955, however, she departed Charleston to return to the inactive fleet. Reclassified MSF-112 on 7 February 1955, four days later she was decommissioned and berthed at Green Cove Springs, Florida. The ship was reclassified as a Coastal Minelayer, MMC-5, on 31 October 1958. The conversion to a coastal minelayer began in Norway in September 1960, and was completed in September 1962. The ship was transferred to the Royal Norwegian Navy on 15 December 1962 and renamed KNM "Uller" (N 50). "Seer" was struck from the Naval Vessel Register on 1 March 1963. "Seer" earned six battle stars during World War II.