; and (2) may use a combination of— (A) procurement of non-developmental air and missile defense systems currently in production to ensure rapid delivery of capability; (B) use of existing systems, components, and capabilities already in the Joint Force inventory, including rockets and missiles as available; (C) operational information technology for communication, detection, and fire control that is certified to work with existing joint information technology systems to ensure interoperability; (D) engagement and collaboration with science and technology, engineering, testing, and acquisition organization and activities in the Department of Defense, including the Defense Innovation United Experimental, the Director of Operational Test and Evaluation, the Defense Digital Service, the Strategic Capabilities Office, and the Rapid Capabilities offices, to accelerate the development, testing, and deployment of existing systems