Definition

Counterinsurgency—military and political operations against insurgent forces trying to overthrow governments. It's the kind of warfare that requires killing the bad guys, winning the population's trust, and somehow doing both simultaneously.

Example Usage

The COIN strategy emphasized protecting the civilian population while targeting insurgent leadership, a balance that proved remarkably difficult to achieve.

Origin

Became formalized doctrine during Vietnam War; extensively developed during Iraq and Afghanistan conflicts

Fun Fact

COIN doctrine emphasizes that you can't kill your way to victory, which is why militaries continue trying to find ways to win through firepower while counterinsurgency experts shake their heads.

Source: FM 3-24 Counterinsurgency doctrine

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