This report will present the latest information on the state of the art of jet thrust reversers as it exists in the United States. During the past two years small and full scale testing and also prototype testing has been conducted. Full scale and prototype units have been statically tested on non-afterburning and afterburning engines. Reverser performance has been measured throughout the engine operating range and included full reverse thrust, modulated thrust and some directional control information. Data is now available which shows reverse thrusts of approximately 40 to 80 percent are possible with little or no effect on over-all aircraft and engine performance.