OSAN AIR BASE, Republic of Korea -- U.S. Air Force Lt. Col Joanna Cooley accepts command of 51st Healthcare Operations Squadron from Col. Mocha Robinson, 51st Medical Group Commander, during a change of command ceremony at Osan Air Base, Republic of Korea, June 18, 2024. Change of command ceremonies are a long-standing military tradition that symbolize the official transfer of power and duties between the departing commander and the incoming commander. (U.S. Air Force Photo by Airman 1st Class Chase Verzaal)