The Arlington County Police Department has adopted a geographic-based policing philosophy. Rather than assigning responsibility by hour of day, personnel will be assigned by district. ... See more Personnel assigned to these districts will be responsible for that area 24 hours a day, 7 days a week. They will be responsible for most police services provided to the community to include response to both emergency and non-emergency calls for service, preliminary criminal investigations, special event planning, and school liaison. Each district is commanded by a Police Captain who reports to the Deputy Chief of Operations.