United States Department of Defense United States Department of Defense The Department of Defense (DoD, USDOD, or DOD) is an executive branch department of the federal government charged with coordinating and supervising all agencies and functions of the government concerned directly with national security and the United States Armed Forces. The department is the largest employer in the world, with nearly 1.3 million active duty servicemen and women as of 2016. Adding to its employees are over 826,000 National Guardsmen and Reservists from the four services, and over 742,000 civilians bringing the total to over 2.8 million employees. Headquartered at the Pentagon in Arlington, Virginia,
Arlington County Fire Department in cooperation with the federal Department of Homeland Security as a part of its stepped up disaster preparedness program. Arlington County Fire Department The Arlington County Fire Department (ACFD) provides fire, emergency medical, and allied public safety services for Arlington County and the City of Falls Church in Virginia, USA. It is highly regarded within the profession as an innovator and leader in enhancing the industry. Among its many firsts are the hiring of the first female career firefighter in the world in 1974 and partnering with the United States Public Health Service to develop America's first Metropolitan Medical Strike