The convergence of training simulations with serious games can incite trainees to a more active participation, improving their learning experience and involvement. Games are difficult and expensive to develop thus, methodologies that support both reuse throughout the M&S lifecycle and interoperability are critical. There are different M&S methodologies proposed to facilitate the development of new serious games for training. However, these methodologies typically do not provide support to the whole M&S life cycle, from behavior modeling to communication and 3D presentation and interaction. In this paper, we introduce an M&S methodology to create, reuse and interoperate 3D serious games for training. We refined and validated this methodology by applying it in a practical undergrad discipline, in which students modeled dozens of emergency management training simulations: from START triage and fire fighting to emergency command and operations system. As results, we present a few developed scenarios.