Clark took command on May 12, the first of a series of key changes in the military command in Korea. On May 19 Vice Admiral Joseph J. Clark became commander of the Seventh Fleet, on May 30 Lt. Gen. Glenn O. Barcus took over the Fifth Air Force, and on June 4 Vice Adm. Robert P. Briscoe became commander of Naval Forces Far East. All brought a new aggressiveness to their commands and were desirous of attacking the hydroelectric plants. Briscoe made the recommendation to Clark on June 6, followed by Weyland the next day.