Suppressive Fire Demonstrated

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Observing the man with the PKM in this video as the shooter, we can't tell if his fire is causing effective suppression (though it's easy to guess that it likely is not). However, observing him as a target, it's clear that the shooter down range returning fire managed effective suppressive fire even though that incoming fire was of low volume. It would appear Mr. PKM failed to stop or prevent his enemy from observing and shooting. Instead, Mr. PKM seems to have been "stopped from observing, shooting, moving, and carrying out military tasks."

Suppressive fire is useful, but only if you know what effective suppression actually is.