The 5th Panzer Division is a Germanarmored unit. Subordinate to the United States V Corps, it played a major role in the defense of West Germany from the Soviet Union during the Cold War; after the Soviet Union's fall, the division remained under American military control (administratively), and has recently sent troops to Yugoslavia.
Also, this unit is technically under NATO control, in the case of a foreign power's attack on a NATO country (this unit might get involved in an attack of Germany, Belgium, France, or other nearby NATO countries). Also, it is unique as being the largest foreign military unit subordinate to an American military unit.
PanzerDivision is the German term for armored division (Panzerdivision).
It is commonly used in English when referring to armored divisions in the German army, Panzer being synonymous with AFV, past or present, and is often treated as part of a proper name, in which case it is always capitalized (e.g., 2nd PanzerDivision).
Panzerdivisions are combined arms formations having both armor and infantry as organic components, along with the usual assets of artillery, anti-aircraft, signals, etc. that are common to most divisions of the industrial era.