As Commander, 14th Air Force, the Air Force's operational space component to the U.S. Strategic Command, General Buck leads more than 19,500 personnel responsible for providing strategic missile warning, nuclear command, control and communication, position, navigation and timing, space situational awareness, satellite operations, space launch and range operations. As Commander, JFCC Space, he directs all assigned and attached USSTRATCOM space forces providing tailored, responsive and synchronized theater and global space effects in support of national security and combatant commander objectives. He is also responsible for protecting and defending critical U.S. and allied space capabilities.

General Buck received his commission in 1986 as a distinguished graduate of Officer Training School. His career spans a wide variety of command, operations, test and evaluation and staff assignments. He has commanded at the squadron, group and wing levels. His operational experience includes missile operations, space launch and range operations, satellite command and control, space force enhancement and space control. General Buck served on the Joint Staff as principal military adviser to the Chairman of the Joint Chiefs of Staff for Coalition Management. In 2010, he deployed to Southwest Asia as the Director of Space Forces for U.S. Air Forces Central. Following his deployment, General Buck was selected to be the Vice Commander, U.S. Air Force Warfare Center. Prior to assuming his current position, General Buck was first the Director for Operations, then Vice Commander, Air Force Space Command.