CREATE TABLE table_56474 ("Navy" CLOB, "Name" CLOB, "Pennant" CLOB, "Commissioned" FLOAT, "Home port" CLOB)

What is the home port of m40?
SELECT "Home port" FROM table_56474 WHERE "Pennant" = 'm40'
SELECT "Home port" FROM "table_56474" WHERE "Pennant" = 'm40'