26 July, 1947 The National Security Act of 1947 became effective, reaffirming the status of the Marine Corps as a separate military service within the Department of the Navy. The Act Provided for Fleet Marine Forces, and confirmed the Corps' mission of seizing and defending advanced bases, as well as land operation incident to naval campaigns. Previous Article 24 July 1944 Next Article 27 July, 1953 Print Day of Month (for ordering)26