The Advanced Framework for Simulation, Integration and Modeling (AFSIM) is an engagement and mission level simulation environment written in C++ originally developed by Boeing and now managed by the Air Force Research Laboratory (AFRL). AFSIM was developed to address analysis capability shortcomings in existing legacy simulation environments as well as to provide an environment built with more modern programming paradigms in mind. AFSIM can simulate missions from subsurface to space and across multiple levels of model fidelity. The AFSIM environment consists of three pieces of software: the framework itself which provides the backbone for defining platforms and interactions, an integrated development environment (IDE) for scenario creation and scripting, and a visualization tool called VESPA. AFSIM also provides a flexible and easy to use agent modeling architecture which utilizes behavior trees and hierarchical tasking called the Reactive Integrated Planning aRchitecture (RIPR). AFSIM is currently ITAR restricted and AFRL only distributes AFSIM within the DoD community. However, work is under way to modify the base architecture facilitating the maintenance of AFSIM versions across multiple levels of releasability.