Acquisition of a system‐of‐systems can be an all new acquisition of multiple systems that are intended to operate together as a system‐of‐systems. Much more common in the U.S. Department of Defense (DoD) is acquisition of one or more new systems that are intended to interoperate with existing systems as a system of systems (SoS) with new capabilities. In either case, successful SoS acquisition necessarily depends on effective contracting structures and processes for SoS acquisition. In this paper, a set of issues that need to be addressed in SoS acquisition are identified, and the current findings discussed. The findings suggest maintaining an extensive systems engineering effort within the SoS acquisition and changes to the existing contracting processes, structures, and organizational structures to maximize the probability of SoS acquisition success. The resulting changes are recommended to current and future DoD SoS acquisitions. ©2012 Wiley Periodicals, Inc. Syst Eng 15