What is the National Security Agency (US)?

Introduction The National Security Agency (NSA) is a national-level intelligence agency of the United States Department of Defence, under the authority of the Director of National Intelligence (DNI). The NSA – a combat support agency – is responsible for global monitoring, collection, and processing of information and data for foreign and domestic intelligence and counterintelligence… Read More


What is the National Geospatial-Intelligence Agency (US)?

Introduction The National Geospatial-Intelligence Agency (NGA) is a combat support agency within the United States Department of Defence whose primary mission is collecting, analysing, and distributing geospatial intelligence (GEOINT) in support of national security. Initially known as the National Imagery and Mapping Agency (NIMA) from 1996 to 2003, it is a member of the United… Read More

What is the Defence Intelligence Agency (US)?

Introduction The Defence Intelligence Agency (DIA) is an intelligence agency and combat support agency of the United States Department of Defence, specialising in defence and military intelligence. A component of the Department of Defence (DoD) and the Intelligence Community (IC), DIA informs national civilian and defence policymakers about the military intentions and capabilities of foreign… Read More

What is the Defence Information Systems Agency (US)?

Introduction The Defence Information Systems Agency (DISA), known as the Defence Communications Agency (DCA) until 1991, is a United States Department of Defence (DoD) combat support agency composed of military, federal civilians, and contractors. DISA provides information technology (IT) and communications support to the President, Vice President, Secretary of Defence, the military services, the combatant… Read More

What is the Defence Health Agency?

Introduction The Defence Health Agency (DHA) is a joint, integrated combat support agency that enables the US Army, US Navy, US Air Force, and US Space Force medical services to provide a medically ready force and ready medical force to Combatant Commands in both peacetime and wartime. The DHA supports the delivery of integrated, affordable,… Read More

What is the Defence Logistics Agency (US)?

Introduction The Defence Logistics Agency (DLA) is a combat support agency in the United States Department of Defence (DoD), with more than 26,000 civilian and military personnel throughout the world. Located in 48 states and 28 countries, DLA provides supplies to the military services and supports their acquisition of weapons, fuel, repair parts, and other… Read More

What is a Combat Support Agency?

Introduction Combat support agency (CSA) is a designation by the United States Department of Defence (DoD) of those defence agencies that provide department-level and tactical support to the US military during combat operations. Background The designation was first outlined by the Goldwater-Nichols Department of Defence Reorganisation Act of 1986, with subsequent additions based on the… Read More