Use the excerpt to answer the question.
“By . . . the authority vested in me as President of the United States, and Commander in Chief of the Army and Navy, I hereby . . . direct the Secretary of War, and the Military Commanders whom he may . . . designate . . . to [recommend] military areas in such places . . . from which any or all persons may be excluded.”
—Franklin D. Roosevelt, Executive Order 9066, February 19, 1942
What did Executive Order 9066 indicate about concerns over national security?