Where is the AA cannon on Captain America?

In the Marvel Cinematic Universe, Captain America wields a shield rather than an AA (anti-aircraft) cannon. However, in comic book adaptations, he has been depicted operating various military equipment, including artillery, but not specifically an AA cannon. His primary role is as a soldier and leader, utilizing his combat skills, shield, and strategic mind in battles. If you meant a specific scene or comic issue, please provide more details for clarification.