Members of the U.S. military service maintain the U.S. national defense. Although some service members work in occupations specific to the military, such as fighter pilots or infantrymen, many work in occupations that also exist in the civilian workplace, such as nurses, doctors, and lawyers. Members serve in the Army, Navy, Air Force, Marine Corps, or Coast Guard, or in the Reserve components of these branches, and in the Air National Guard and Army National Guard. (The Coast Guard is part of the Department of Homeland Security.) Please select and click on the links below for more information about Careers in the Military.