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Officer's Day is an event that occurs on November 11th in Animal Crossing. On this day, the town will celebrate the town's police officers, Booker and Copper, on their various deeds and contributions to the town. Talking to the mayor will result in the player receiving a police station model.
The event may be a reference to the real-life Remembrance and/or Veterans Days, which also takes place on November 11th to honor armed forces and veterans.