Jagdtiger ("Hunting Tiger") is the common name of a German tank destroyer of World War II. The official German designation was Panzerjäger Tiger Ausf. B. The ordnance inventory designation was Sd. Kfz. 186. It saw service in small numbers from late 1944 to the end of the war on both the Western and Eastern Front. The Jagdtiger was the heaviest armored fighting vehicle operationally used during World War II. Due to an excessive weight the Jagdtiger was continuously plagued with mechanical problems.