assigned to Deny Flight were transferred to Operation Decisive Endeavor, to provide support for new IFOR peacekeepers in Bosnia. Structure of forces Throughout the course of its operation, Deny Flight was directed by Allied Forces Southern Europe (AFSOUTH) in Naples, under the command of the Commander-in-Chief of Allied Forces Southern Europe. At the beginning of the operation, Admiral Jeremy Boorda served as the commanding officer; he was replaced by Admiral Leighton W. Smith in 1994. Smith and Boorda, however, delegated day to day authority to Allied Air Forces Southern Europe (AIRSOUTH) commanded by Lieutenant General Joseph W. Ashy (until 1994) and then Lieutenant General Michael E. Ryan. While AIRSOUTH maintained day to day command, "mission tasking and operational control" were delegated to the commander of the NATO 5th Allied Tactical Air Force (5ATAF), initially Lt Gen Antonio Rosetti and later Lt Gen Andrea Fornaserio, both of the Italian Air Force. To simplify the chain of command and coordinate activities, NATO established the Combined Air Operations Center (CAOC) in Vicenza, Italy, which assumed practical day-to-day control of Deny Flight and reported to the commander of the 5ATAF. Each squadron participating in the operation sent a liaison officer to the CAOC to ensure coordination. The initial director of the CAOC was Lt Gen James Chambers of the US Air Force. In November 1994, Major General Hal Hornburg replaced him. In practice, most tactical level decisions about Deny Flight were made by the director of the CAOC, and he had the authority to order NATO pilots to engage violators of the no-fly zone. Twelve NATO countries provided forces to Operation Deny Flight: Belgium, Canada, Denmark, France, Germany, Italy, the Netherlands, Norway, Spain, Turkey, the United Kingdom and the United States. Together, these twelve states contributed a total of 4,500 personnel who were based at air bases in five countries: France, Germany, Greece, Italy, and the United Kingdom and on aircraft carriers in the region. Eight of the participating countries contributed a total of 239 aircraft to the operation, of which nearly half, 108, came from the United States. Within the United States, the US Navy and US Marine Corps provided the most support for the operation, and together they flew 70% of all of the air defense sorties flown during Deny Flight. American aircraft also provided the majority of the airstrikes during the conflict; of the 1,150 bombs dropped by NATO forces, 88%