The Department of Defense (DOD) acquires goods and services from contractors, federal arsenals, and shipyards to support military operations. Acquisitions is a broad term that applies to more than just the purchase of an item of service; the acquisition process encompasses the design, engineering, construction, testing, deployment, sustainment, and disposal of weapons or related items purchased from a contractor. As set forth by statute and regulation, from concept to deployment, a weapon system must go through a three-step process of identifying a required weapon system, establishing a budget, and acquiring the system. One of DOD’s main efforts to improve acquisitions is the Better Buying Power Initiative. This book provides an overview of the process by which DOD acquires weapon systems and discusses recent major efforts by Congress and the Department of Defense to improve the performance of the acquisition system.