Definition

When trained local forces (green) turn their weapons on allied forces (blue)โ€”the military's worst trust exercise.

Example Usage

The green on blue incident killed five NATO soldiers.

Origin

Military color-coding system; used extensively after 2001

Fun Fact

One of the leading causes of coalition casualties in recent conflicts

Source: Military Intelligence Reports

Translate This Term

See “Green on Blue” in Corporate Speak, Gen-Z Slang, Pirate Speak, and more.

Try the Translator