From the Document: "Joint All Domain Command and Control (JADC2) is the Department of Defense's (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. Traditionally, each of the military services developed its own tactical network that was incompatible with those of other services (i.e., Army networks were unable to interface with Navy or Air Force networks). DOD officials have argued that future conflicts may require decisions to be made within hours, minutes, or potentially seconds compared with the current multiday process to analyze the operating environment and issue commands. They have also stated that the Department's existing command and control architecture is insufficient to meet the demands of the National Defense Strategy (NDS). Congress may be interested in the concept because it is being used to develop many high-profile procurement programs for all of the military services."
CRS In Focus, IF11493
Congressional Research Service: https://crsreports.congress.gov/