The Defense Department's top acquisition official has issued a memorandum to the services and defense agencies defining DOD's process of spiral development, the new approach to fielding military systems. Under Secretary of Defense for Acquisition, Technology and Logistics Pete Aldridge wrote April 12 that "there has been some confusion" about what spiral development and other, related terms mean, "and how spiral development impacts various processes such as contracting and requirements generation that interface with an evolutionary acquisition strategy." The purpose...