The United States Department of Defense is the largest employer in the world, with over 3.2 million employees. Founded in 1947, the Department of Defense is responsible for protecting the United States from attack and providing military support to other countries.
The Department of Defense is a major contributor to the US economy, with a budget of over $700 billion. It is also a major employer of scientists, engineers, and other professionals. The Department of Defense has a long history of innovation, having developed many technologies that are now used in civilian applications, such as the internet and GPS.