The United States spends approximately $553 billion per year in national defense. A large percentage of that massive annual spending goes to the procurement of new weapons systems, facilities, equipment, supplies, logistical and technical services to be used in defense of the United States. In addition, the government spends billions of dollars to upgrade and repair current weapons systems, equipment and facilities. The overwhelming majority of this defense procurement is done through contracts with private businesses in the United States and around the world.