The Department of Defense, often referred to as the DoD, hires contractors to perform various duties in different regions of the world. DoD contract jobs are for civilian personnel; these employees are independent contractors, not staff of the DoD. Your responsibilities vary, depending on the details of each project. Some examples of DoD contractors include security agents for government and business personnel. Other positions help construct buildings, set up IT infrastructure for military operations, provide medical equipment or services at military installations, or assist with engineering projects. These jobs are temporary, and the length of each assignment can vary.