Technology and threat change is outpacing Defense Acquisition and M&S development processes. The current M&S architectures do not support agility. DoD struggles with interoperability between simulations and reuse of models and data. Models and data generated in new capability design and development are often not available for testing, analysis or training systems development. M&S Community stovepipes inhibit data and model sharing and reuse, partially because M&S is funded and managed separately by each community. There is no easy fix, as DoD lacks a coherent process or infrastructure to rapidly develop and deliver new M&S capabilities based on emerging technologies and threats. This paper will explore existing modeling frameworks that enable integration below the federate level and could provide an infrastructure for agile simulation to facilitate perpetual prototyping and rapid development.