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

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