Admiral Elmo Zumwalt who screwed up the Navy.
Zumwalt set out in the early 1970's to make the Navy a kinder, gentler organization and wound up degrading discipline and moral, and made the Navy a less effective and more dangerous organization. I experienced it and watched it happen.
He lobbed stupidity like hand grenades in the form of directives called "Z Grams". If he had been given a code name it should have been SNAFU.