CREATE TABLE table_17727 ("Ship" CLOB, "Builder" CLOB, "Namesake" CLOB, "Renamed" CLOB, "Laid down" FLOAT, "Launched" CLOB, "Commissioned or completed ( * ) " CLOB)

When was the ship tecumseh launched?
SELECT "Launched" FROM table_17727 WHERE "Ship" = 'Tecumseh'
SELECT "Launched" FROM "table_17727" WHERE "Ship" = 'Tecumseh'