From the Army’s perspective, close air support (CAS) is one of the primary support functions that the U.S. Air Force provides to Army combat operations. A benchmark 1948 policy agreement among the services, the Key West Agreement, originally delineated this function. This agreement integrated the Armed Forces into an “efficient team of land, naval, and air forces,” and, within that arrangement, the Air Force was given a primary mission to furnish close combat and logistical air support to the Army, to include air lift, support, and resupply of airborne operations, aerial photography, tactical reconnaissance, and interdiction of enemy land power and communications. Historically, CAS has been a function assigned to Air Force fixed wing aircraft. Assignment of CAS responsibility to the Air Force grew out of the Key West Agreement of 1948. Since that time, however, the nature of combat and weaponry has evolved to a high level of technological sophistication. This was illustrated in combat experiences, as in Just Cause in Panama and the Persian Gulf War.