Joint All-Domain Command and Control: Background and Issues for Congress [Updated July 8, 2021] [open pdf - 2MB]
From the Summary: "The Department of Defense (DOD) is in the process of a once-in-a-generation modernization of its approach to commanding military forces. Senior DOD leaders have stated that the department's existing command and control architecture is insufficient to meet the demands of the 2018 National Defense Strategy (NDS). Joint All-Domain Command and Control (JADC2) is DOD's concept to connect sensors from all of the military services--Air Force, Army, Marine Corps, Navy, and Space Force--into a single network. [...] As DOD develops new methods to command and control military forces, Congress may consider several potential issues:  How can Congress consider JADC2-related activities in advance of validated requirements or cost estimates?  How can DOD ensure interoperability among each of the military services' and allies' communications systems?  How should DOD prioritize competing communications requirements for its future network?  What role will artificial intelligence play in future command and control decisionmaking systems?  What potential force structure changes will be necessary to meet JADC2 requirements?  How should DOD manage JADC2-related efforts?"
CRS Report for Congress, R46725
Congressional Research Service: https://crsreports.congress.gov/