Simulation proponents are driven to replace existing simulations as a result of several factors. These include obsolete and inefficient source code, maintenance costs to upgrade aging hardware, need for expanded capability, and the requirement to be compliant with the DoD mandated High Level Architecture (HLA). Good business practices argue against the wholesale replacement of simulations due to the enormous cost of developing entirely new systems. TRADOC, faced with the need to maintain a entity-level simulation despite increasing maintenance costs and limited expansion capability, reengineered the Janus simulation with a new architecture, rehosted on personal computers, and modified to meet the HLA mandate. The reengineered simulation is known as HLA Warrior. The paper addresses the policy management decision process to modify and adapt simulations rather than replace them. Using Janus/HLA Warrior as a case study, the paper details a non-technical process for rehosting a legacy simulation with modern technology, to include achieving HLA compliance. The paper also discusses in-house versus outsourced tasks, budget management considerations, and modern architecture capabilities.