VALT stood for VTOL Approach and Landing Technology. This 1967 CH-47B, 66-19138, was assigned to NASA Langley and NASA Ames from 1 July 1974 until 1989 as NASA 543, NASA 544, N544NA and NASA 737. It was then rebuilt as a CH-47D, 89-00176, and was still in US Army service as of 2024 as as CH-47F, 13-8134. Photo from: NASA Langley
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