I'll concede this one to Mr. Delawder.
The Independence Class (CVLs 22-30), Gerald Ford (Assistant Navigation Officer, USS Monterey, CVL 26) and George Bush (pilot, VT-51, USS San Jacinto, CVL 30) are correct answers, but Franklin Pierce lived about a hundred years too early to have a personal association.
The third President was Franklin Delano Roosevelt. The conversion of Cleveland Class light cruisers to fast escort carriers was FDR's brainchild, proposed in mid 1941.
The Navy was opposed to the idea; experts worried that the hulls of the Cleveland Class would not be provide stable aircraft launch and recovery platforms, would provide limited aircraft storage and maintenance facilitities and would have poor seakeeping characteristics.
But FDR persisted and CL to CV conversions were authorized after the Pearl Harbor attack, beginning with CL-59, USS Amsterdam, to be redesignated CV-22 USS Independence. In 1943, the Independence Class vessels were reclassified as CVLs. Although some of the Navy's concerns proved to be valid, the CVLs were generally considered to be a successfull class.
As Alumni72 noted, Bush was shot down, and 1970's comedians had a field day with Ford's unfortunate tendency to fall down.
Due to his polio, FDR spent most of his time in office, sitting down.
Mr. Delawder, you are up next.