I remember C3I – Command, Communications, Control, and Intelligence. What’s the fourth C in C4I?
Where I work, it’s: Command, Control, Coordination, Communication & Intelligence.
YMMV.
Stranger
Belay my last. I just checked, and just as Stranger posted, it is computers where I’m at. Now, we have 4CISR: command, control, communications, computers, intelligence, surveillance and reconnaissance.