A Greek Air Force STAFF Sergeant prepares his plane, a C-130 Hercules transport aircraft, for takeoff during the Partnership for Peace Exercise COOPERATIVE KEY '96 at Otopeni Air Base, just north of Romania's capitol. The exercise involves Air Force training in operational and logistical interoperability procedures based on a humanitarian relief scenario. Participating NATO Air Forces from Greece, Italy, Turkey and the United States will join the nations of Slovakia, Muldavia, Czech Republic and the host nation Romania