After 1956, the task of modifying the APS-2F radars so they could be fielded as WSR-1s, -1As, -3s, and -4s was transferred to Weather Bureau headquarters, which had to relocate some antennas that had been mounted in locations where they were difficult to maintain. At the height of the program in April 1975, 82 of the WSR-1s, -1As, -3s, and -4s were operational.
After 1956, adjusting APS-2F radars for use as WSR-1s, -1As, -3s, and -4s was transferred to Weather Bureau headquarters. This necessitated moving some antennas that were hard to maintain. By April 1975, when the program reached its peak, 82 of these radars were operational.