A military operation that is either designated by the Secretary of defence as a contingency operation or becomes a contingency operation as a matter of law (Title 10, United States Code, Section 101(a)(13)). It is a military operation that: a. Is designated by the Secretary of defence as an operation in which members of the Armed Forces are or may become involved in military actions, operations, or hostilities against an enemy of the United States or against an opposing force; or b. Is created by definition of law. Under Title 10, United States Code, Section 101 (a)(13)(B), a contingency operation exists if a military operation results in the (1) call-up to (or retention on) active duty of members of the uniformed Services under certain enumerated statutes (Title 10, United States Code, Sections 688, 12301(a), 12302, 12304, 12305, 12406, or 331-335); and (2) the call-up to (or retention on) active duty of members of the uniformed Services under other (non-enumerated) statutes during war or national emergency declared by the President or Congress.