The mission of John C. Stennis and her air wing (CVW-9) is to conduct sustained combat air operations while forward-deployed.
For defense, in addition to her air wing and accompanying vessels, John C. Stennis has NATO RIM-7 Sea Sparrow and Rolling Airframe Missile (RAM) surface-to-air missile systems, the Phalanx Close-in Weapons System for cruise missile defense, and the AN/SLQ-32 Electronic Warfare System.