A history of high-speed airbreathing propulsion ramjet engines and their respective vehicle and weapon systems developed under the support of the U.S. Navy is presented. These include surface-and air-launched subsonic combustion ramjets, supersonic combustion ramjets (scramjets), and mixed-cycle ramjet/scramjet/rocket engines intended primarily for missile applications for ight speeds from Mach 2 to Mach 8. A summary of the development of the joint Department of Defense/NASA-sponsored National Aerospace Plane is also presented. Nomenclature= freestream 1-6 = engine stations (Fig. 1

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