He patented a number of innovations relating to rotary wing aircraft. Some types of variable geometry craft transition between fixed wing and rotary wing configurations. The FAA operates fixed wing and rotary wing aircraft. In 1960 the US Army settled for a rotary wing platform. The LHTEC T800 is a turboshaft engine for rotary wing applications. Aerial intelligence surveillance and reconnaissance systems onboard fixed wing and rotary wing aircraft. A gyroplane is both fixed-wing and rotary wing. US Navy rotary wing squadron designations start with the letter H. Not all ASTs serve as rotary wing helicopter rescue swimmers. Each company operates both fixed and rotary wing aircraft. Flight mechanics are relevant to fixed wing (gliders, aeroplanes) and rotary wing (helicopters) aircraft. Rotary wing aircraft wingtips may be swept or curved to reduce noise and vibration. Today the largest section of the FAA is the rotary wing section. Military rotary wing fuel tanks have the additional feature of being crashworthy. Some rotary wing aircraft place their propulsion in wingtip tip jets.