"David Cornell Leestma"@en . "David Cornell Leestma (born May 6, 1949) is a former American astronaut and retired Captain in the United States Navy."@en . . . . . "1949-05-06Z"^^ . "American astronaut" . . "Leestma, David"@en . . "1949Z"^^ . "1.91712e+06"^^ . . "Retired" .