A Navy ordnance officer checks over an AIM-9 Sidewinder missile mounted on an AH-1W Sea Cobra helicopter on the flight deck of the amphibious assault ship USS Tarawa (LHA-1) during the combined Thai/U.S. joint exercise Thalay Thai '89. The helicopter is assigned to Marine Medium Helicopter Squadron 163 (HMM-163), the reinforced aviation combat element of the 11th Marine Expeditionary Unit (11th MEU)