3-3. Military forces that conduct DSCA missions under federal authority may include Regular Army, Marine Corps, Navy, and Air Force; activated Army, Marine Corps, Navy, and Air Force Reserves; and National Guard units placed in federal service. Federal service is a term applied to National Guard members and units when called to active duty to serve the United States Government under Article I, Section 8 and Article II, Section 2 of the Constitution and the Title 10, United States Code, Sections 12401 to 12408 (JP 4-05).