(a) Modular Open System Approach Requirement.—
A major defense acquisition program that receives Milestone A or Milestone B approval after January 1, 2019, shall be designed and developed, to the maximum extent practicable, with a modular open system approach to enable incremental development and enhance competition, innovation, and interoperability.
(b) Definitions.—In this chapter:
(1) The term “modular open system approach” means, with respect to a major defense acquisition program, an integrated business and technical strategy that—
is subjected to verification to ensure major system interfaces comply with, if available and suitable, widely supported and consensus-based standards;
(C) uses a system architecture that allows severable major system components at the appropriate level to be incrementally added, removed, or replaced throughout the life cycle of a major system platform to afford opportunities for enhanced competition and innovation while yielding—
increased interoperability, including system of systems interoperability and mission integration; or
other benefits during the sustainment phase of a major weapon system; and
complies with the technical data rights set forth in section 2320 of this title.
(3) The term “major system component”—
includes a subsystem or assembly that is likely to have additional capability requirements, is likely to change because of evolving technology or threat, is needed for interoperability, facilitates incremental deployment of capabilities, or is expected to be replaced by another major system component.
(4) The term “major system interface”—
means a shared boundary between a major system platform and a major system component, between major system components, or between major system platforms, defined by various physical, logical, and functional characteristics, such as electrical, mechanical, fluidic, optical, radio frequency, data, networking, or software elements; and