system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does ISIS still exist and stay so strong although many nations have sent so much armed forces to hunt them down?
gpt
Much of the action against ISIS has taken the form of air strikes, special forces actions, and more conventional actions. To be effective against a guerrilla force, you need to have a large number of troops constantly occupying their power base areas to prevent them from moving and resupplying, while building good will with the local populace to prevent the guerrillas from recruiting.