A 'Man Amplifier' By Cornell Aeronautical Laboratories
The 1966 book Bionics: Nature's Ways for Man's Machines by Robert Wells has some great pictures of the "Man-Amplifier."
Cornell Aeronautical Laboratories of Buffalo, New York were producing papers on Man Amplifiers as early as 1960. In 1961 they received a grant to explore these ideas. Initial work was on an exoskeleton, and later work on a mock-up.