A Modular Open Systems Approach (MOSA) is an acquisition and engineering tactic focused on achieving lifecycle goals for a product or family of products. These lifecycle goals should address both business and technical needs in support of Army acquisition strategies. An effectively applied MOSA results in reduced total ownership cost and can be quickly customized, analyzed, modified, extended and certified throughout the product lifecycle in response to changing user requirements and technology obsolescence management or advancement.? Modular, open architectures enable rapid, more efficient capability development, upgrades and technology insertion.? Army Enterprise Architecture efforts will employ MOSA and common modular open architectures that include strategic commodity plans, the use of common data & interface standards, and facilitate shared reuse opportunities for key commodities (e.g., hardware, software, data, edge devices, etc.).? The Army Training Enterprise Architecture will integrate and interoperate across PEO enterprise product lines and operational capabilities with the Synthetic Training Environment to enhance Soldier training realism and the user experience.