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Red Grandy ©Stars and StripesHeidelberg, Germany, June, 1977: The noise three-year-old Sonja Hashing is blocking out was, as it turned out, a sound few people ever got to hear: The engines of a prototype YC-14 AMST (Advanced Medium Short Takeoff and Landing Transport), the would-be successor to the C-130 Hercules, which was about to make a demonstration flight at rain-soaked Heidelberg Army Airfield. Neither Boeing's YC-14 nor McDonnell Douglas' competing YC-15 ever went into full production, mainly because of rising costs and questions about cost-effectiveness. Both YC-14 prototypes are in Tucson, Ariz., one at the Pima Air and Space Museum and the other at the Boneyard.RELATED MATERIAL:Stars and Stripes' 1977 story about the YC-14, with more photos.