Definition

Signals Intelligence—the military's polite term for eavesdropping on enemy communications and intercepted transmissions. It's essentially high-tech spying where you intercept, decode, and analyze radio signals, emails, and other electronic chatter to figure out what your adversaries are planning. Turns out the NSA didn't invent mass surveillance; they just perfected it.

Example Usage

The SIGINT operation revealed the enemy's troop movements three days before the planned offensive.

Source: Military intelligence terminology

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