Definition

Command, Control, Communications, Computers, and Intelligence. The nervous system of modern military operations—without it, your army becomes very confused and violent.

Example Usage

The new C4I system improved coordination between all operational units by 40%.

Origin

Military information systems doctrine, formalized 1970s-1980s

Fun Fact

Cyberattacks targeting C4I infrastructure are considered existential threats in modern warfare.

Source: NATO Defense Communications Doctrine