DoD contractor jobs include a wide variety of positions that supplement the daily activities of the Department of Defense, which is a part of the government of the United States. As part of a private organization, you may provide help to military or intelligence services, help manage civilian contacts, or do almost anything else for which the DoD needs outside people. Roles in this field often focus on security and engineering. For example, a DoD contractor might help install and maintain elevators on military bases or deliver food and other packages. Many DoD contractor positions require you to work on or near military bases and other sensitive facilities, making the majority of them geographically limited roles.