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, modifying APS-2F radars for use as WSR-1s, -1As, -3s, and -4s was transferred to Weather Bureau headquarters. This required relocating some antennas that were difficult to maintain. By April 1975, when the program reached its height, 82 of these radars were operational.