Formally they are called the Metropolitan Police Department. Often this is shortened to Metro PD or Washington Metro PD.
http://mpdc.dc.gov/mpdc/site/default.asp
You capitalize 'police' after the department name, where the word is part of the department name, as in, 'The Somerville Police Department is looking to recruit more policeofficers.'
A "Metro" or "Metropolitan" police department is usually one that works over several governmental boundaries or was formed from smaller agencies. The Las Vegas Metropolitan Police Department is an example of this. The department was formed from the former Las Vegas Police Department and Clark County Sheriff's Office.Added: Two other examples: The Metropolitan Police of The District of Columbia (MPDC) is the city police department of Washington, DC and when it was formed it took its name from the "Metropolitan Police" of London.In the same geographical area is: The Washington Metropolitan Area Transit Authority Police (commonly referred to as the "Metro Police" because the subway system in Washington DC and the Maryland and VIrginia suburbs is known as "The Metro"). Members of this department are certified and sworn as LEO's in all three jurisdictions.
NYPD (New York police department
Police is a common noun. Proper nouns name a specific police officer or a specific police department. Examples: Officer Glen Martin The Glendale Police Department
Yes.
Internal Security Department
They are officially known as "The Hong Kong Police Force."
Yes, but they do not share the information.
The department set up by Washington to help carry out the duties of the presidency was the cabinet
The department set up by Washington to help carry out the duties of the presidency was the cabinet
There isn't a sheriff for West Bend. West Bend is part of Washington County, WI and the County has an elected sheriff. I don't know what his name is but you could find it on their home page. West Bend has its own Police Department, of which I was a member of in the 70's. That department is headed by a Chief of Police. That person is appointed by either the Police & Fire Commission or the City Council and/or City Administrator. That name could be obtained by looking at the WBPD website.
You would normally name the police officer (driver) and his employer, e.g. the city or police department where he works.