In this chapter (the Uniform Code of Military Justice): (1) The term "Judge Advocate General" means, severally, the Judge Advocates General of the Army, Navy, and Air Force and, except when the Coast Guard is operating as a service in the Navy, an official designated to serve as Judge Advocate General of the Coast Guard by the Secretary of Homeland Security. (2) The Navy, the Marine Corps, and the Coast Guard when it is operating as a service in the Navy, shall be considered as one armed force. (3)
Whenever there is a declared war between the United States and any foreign nation or government, or any invasion or predatory incursion is perpetrated, attempted, or threatened against the territory of the United States by any foreign nation or government, and the President makes public proclamation of the event, all natives, citizens, denizens, or subjects of the hostile nation or government, being of the age of fourteen years and upward, who shall be within the United States and not actually naturalized