This document reports results from a research project entitled, Developing a Strategic Framework for Army Regeneration. The purpose of the project was to assess the Armys ability to regenerate active component end strength using a variety of accessions, retention, and force management policies. This report presents a historical synthesis of the Armys efforts to expand during the decade following September 11, 2001. It identifies the various policy levers the Army can use to achieve its targets and conducts an empirical analysis of the limits on the Armys ability to expand under a variety of external conditions. It also identifies the larger policy implications of maintaining the capacity to expand as necessary.