CREATE TABLE table_74444 ("Series #" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "France air date" TEXT, "Canadian air date" TEXT, "US air date" TEXT)

What is the US air date when the director is ken girotti?
SELECT "US air date" FROM table_74444 WHERE "Directed by" = 'Ken Girotti'
SELECT "US air date" FROM "table_74444" WHERE "Directed by" = 'Ken Girotti'