Table: echo_submarine
Columns: shipyard
laid_down
launched
commissioned
fleet
status

Question: Tell me the launched for august 31, 1964
SQL: SELECT "launched" FROM echo_submarine WHERE "commissioned" = 'august 31, 1964'

Question: Tell me what was commissioned december 30, 1965
SQL: SELECT "commissioned" FROM echo_submarine WHERE "launched" = 'december 30, 1965'