U.S. Air Force Maj. Gen. Ronald Ladnier, commander of 17th Air Force and U.S. Air Forces Africa, presents Col. Gregory Petrequin the Air Force Meritorious Service Medal during a change of command ceremony at Camp Lemonier, Djibouti, Feb. 27. Col. Petrequin is the outgoing commander of the 449 Air Expeditionary Group at Camp Lemonier, Djibouti in the Horn of Africa.