Final answer:
Counterair is a mission that integrates offensive and defensive operations to attain and maintain air superiority, as exemplified by the Battle of Britain.
Step-by-step explanation:
Counterair is a mission that combines offensive and defensive operations to achieve and maintain air superiority. It involves using various strategies to gain control over the airspace in relation to the adversary. A notable example of this is the Battle of Britain, where the Royal Air Force successfully defended their air defenses against the German Luftwaffe, preventing a planned invasion. Overall, counterair and air control are key components of military operations in the air domain.