Which shipyard has a fleet that was laid down on April 21, 1962?
CREATE TABLE table_name_72 (shipyard VARCHAR, laid_down VARCHAR)
SELECT shipyard FROM table_name_72 WHERE laid_down = "april 21, 1962"
### Context: CREATE TABLE table_name_72 (shipyard VARCHAR, laid_down VARCHAR) ### Question: Which shipyard has a fleet that was laid down on April 21, 1962? ### Answer: SELECT shipyard FROM table_name_72 WHERE laid_down = "april 21, 1962"