What does deterrence by denial mean in Marine operations?

• A. Deterring adversaries by ensuring they cannot achieve their objectives due to credible, capable, and prepared forces
• B. Deterrence by punishment after aggression occurs
• C. Deterring by economic sanctions
• D. Deterring by diplomacy alone

Answer: (A)

Deterrence by denial focuses on preventing an adversary from achieving their objectives by making success physically unlikely or impossible through credible, capable, and prepared forces. In Marine operations this means having forward-deployed, ready forces and defenses that to a potential aggressor appear able to stop, disrupt, or degrade their plan before it can succeed. When an adversary sees robust island or coastal defense, air and missile defense, sea control, and well-integrated fires and maneuver, they weigh the costs and risks and often decide not to attempt the action at all.

This is different from deterrence by punishment, which relies on the threat of costs after aggression occurs, or from economic sanctions or diplomacy alone, which do not demonstrate the capability to deny success on the battlefield.