The Department of Defense is composed of several parts. The Army, Navy, Air Force, and Marine Corps each have their own bureaus (or organizations) that are responsible for carrying out a range of missions. These bureaus are responsible to many tasks, from testing and procurement to training and testing. These organisations operate both on the national and international levels. The Department of Defense is a government-funded entity, which is led by the Secretary of Defense. Among other functions, the Department of Defense is responsible for the procurement of defense equipment and technology. The Department of Defense is also responsible for research and development, military training, and personnel management. Last but not least, the Department of Defense coordinates military's global activities.
There are many federal agencies in addition to the Department of Defense. These include the Office of the Secretary of Defense (or Defense Advanced Research Projects Agency), and the Department of Energy. The Department of Energy, Department of Defense Accountability Office and Department of Defense Inspector General are all other agencies. The Department of Defense includes the Office of the Secretary of Defense for Acquisition and the Office of the Assist Secretary of Defense for Science and Technology. Other agencies include the Office of the Secretary of Defense and the Office of the Assistant Secretary of Defense for Strategic Concepts. There are also several organizations tasked with assessing the state of the nation's defenses, determining the feasibility of various strategies, and devising a unified national defense plan. The National Defense Sustainment and Logistics Review is also managed by the Department of Defense.
The Department of Defense also has an Independent Advisory Panel on Weapon System sustainability. This group has been around for some time and has the job of advising the Department of Defense on matters pertaining to weapon system sustainability. This group includes representatives of academia, defense industry, and the Armed Services. The group has completed a number of studies about the feasibility of different technologies, and will recommend which path to take in order to meet future demands.
The Department of Defense owns an extensive inventory of assets. This includes the total aircraft inventory, the number and personnel of aircraft and personnel within the Army, Navy and Air Force, as well as the military personnel within the various branches. This inventory includes a number of subinventory groups such as the Air Force or Joint Staff and the force positioning group. This inventory is maintained by the Department of Defense. Anyone can access it by using a Department of Defense username and password. The inventory's most important component is the force posture. This refers to the military's readiness for combat. This is essential because it directly affects the effectiveness of the force.
There are many accomplishments that the Department of Defense can boast. Its most prominent accomplishments include the design and deployment of F-35A fighter airplanes. This aircraft can be used for both air refuelling tanker aircraft and air base defense against potential missile threats. The Air Force also has a large aircraft procurement plan for fiscal year 2020. It includes executive and operational lift aircraft.