The Army Modeling & Simulation Office (AMSO) spearheaded the first ever Army Modeling and Simulation Capability Portfolio Review (M&S CPR) in 2015 to identify current M&S capabilities and gaps. This paper will describe the M&S CPR process and results, demonstrate how AMSO facilitates Army Enterprise M&S solutions for critical M&S needs; how the process enables communication and sharing between Army communities, Joint, and Industry partners; and provides long term prioritized planning for M&S needs to address Army strategic goals. The M&S CPR identified 394 M&S tools in active use and M&S enterprise gaps in the following areas: Chemical, Biological, Radiological, and Nuclear (CBRN); Cyber / Electronic Warfare (EW); Fires; Intelligence; Network; Resourcing; Sensors; Terrain; and Workforce. Each M&S gap area formed a working group to analyze and refine gaps, identify the communities impacted, and discover ways to close gaps to meet Army needs and mission requirements. In February 2016, the first annual Army M&S Gaps Forum brought together the working groups and stakeholders in Fort Belvoir, VA to discuss M&S gap resolutions. The resultant courses of action provided to the M&S Governance Forums included recommendations for policy updates, procedure changes, capability sharing, studies for new research and methodology development, and improvements to existing models and simulations. The processes and results documented in this paper will provide readers with: A method to assess capabilities distributed across multiple organizations, commands, and communities; Insights on Army M&S gaps, areas needing support from Joint Services, DOD, and Industry; The Army enterprise approach to M&S capability gaps and how to get involved.