President Roosevelt’s Neutrality Proclamation of September 5, 1939, among other things, prohibited Americans from accepting commissions with belligerents, or enlisting in the service of a belligerent. Hiring persons to enlist, or going beyond the jurisdiction of the United States with the intent to join belligerent forces, were also prohibited.[205] By Act of March 28, 1940,[206] Congress extended application of an earlier prohibition[207] on unauthorized entry on military reservations to the outlying possessions of the United States. A year later it granted the Secretaries of War and Navy, jointly or singly, power to define areas within such reasonable distance of any military or naval camp or station in which prostitution would be prohibited by federal law. By Proclamation of December 27, 1941 President Roosevelt established the Hawaiian Maritime Control Area, and regulated entry, radio calls, visual communications, and traffic in that area. Naval authorities were granted power to establish supplementary regulation.[208] Subsequently, the President established Maritime Control Areas for Cristobal and the Gulf of Panama,[209] Boston,[210] San Francisco, Columbia River, Puget Sound, Southeastern Alaska, and other areas.[211] On May 20, 1942, invoking his powers as Commander-in-Chief, the President established the Padre Island Sea Range Area, and imposed regulations controlling entry to an activity in that area. The next day he signed into law an enactment providing a maximum penalty of $5,000 fine and one year imprisonment for knowingly violating restrictions established by the President, the Secretary of War, or military commanders designated by him, on entering, remaining in, leaving, or committing proscribed acts in military areas or zones.[212] The areas thus far described were defined principally for exclusionary purposes. It is not unusual to define areas with a view to confining therein specific persons or categories of persons. Invoking a 1909 statute, the President on September 5, 1939 made it illegal for interned members of the armed forces of belligerent nations to leave the jurisdiction of the United States, or the limits of their internment, without permission.[213] In a later proclamation the President stipulated that no alien would be permitted to depart from the United States if the Secretary of State were satisfied that the alien’s departure would be prejudicial to the interests of the United States.[214]