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The NVAP (Night Vision Aerial Periscope,) Tracking Hi-Lo Beam Infrared Illuminator and LTD (Laser Targer Designator,)was half the cost of the airplane. 

The PDF below was goven to the Quiet Aircraft Association by Dick Vernon's brother. Dick Vernon was an engineer at Xerox Electro-Optical Sysytems on the YO-3A IRI-NVAP Mission equipment project. 

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