Military strategist John Boyd similarly draws a contrast between command as directing, ordering, or compelling and control as regulating, restraining, or holding to a certain standard. The adoption of command and control to combat the disorder of the battlefield thus unmistakably echoes the use made by cybernetic systems of information feedback to stave off entropic decay. The centrality of information to this new conception of military command is consistently evidenced by the litany of acronyms employed to refer to this function: C2 (Command & Control), C3 (C2 plus Communications), C4I2 (C3 plus Computers, Intelligence & Interoperability), C2ISR (C2 plus Intelligence, Surveillance, Target Acquisition & Reconnaissance), etc.