CREATE TABLE table_4453 ("Shipyard" TEXT, "Laid down" TEXT, "Launched" TEXT, "Commissioned" TEXT, "Fleet" TEXT, "Status" TEXT)

Which fleet launched on July 30, 1961?
SELECT "Fleet" FROM table_4453 WHERE "Launched" = 'july 30, 1961'
SELECT "Fleet" FROM "table_4453" WHERE "Launched" = 'july 30, 1961'