Instructions: In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.
Input: Passage: The British Army conducted only relatively infrequent patrols along its sector of the inner German border, principally for training purposes and symbolic value. By the 1970s, it was carrying out only one patrol a month, only rarely using helicopters or ground surveillance radar and erecting no permanent observation posts. The British border zone was divided into two sectors covering a total distance of about 650 kilometres (400 mi) along the border. Unlike the Americans, the British did not assign specific units to border duty, but rotated the task between the divisions of the British Army of the Rhine.The border was also patrolled in the British sector by the British Frontier Service, the smallest of the Western border surveillance organisations. Its personnel served as a liaison between British military and political interests and the German agencies on the border. The BFS was disbanded in 1991 following Germany's reunification.The United States Army maintained a substantial and continuous military presence at the inner German border throughout the entire period from 1945 to after the end of the Cold War. Regular American soldiers manned the border from the end of the war until they were replaced in 1946 by the United States Constabulary, which was disbanded in 1952 after policing duties were transferred to the German authorities. It was replaced by three dedicated armoured cavalry regiments assigned to provide a permanent defence. The 3rd Armored Cavalry Regiment based at Bamberg, 2nd Armored Cavalry Regiment based at Nuremberg and the 14th Armored Cavalry Regiment based at Fulda – later replaced by the 11th Armored Cavalry Regiment – monitored the border using observation posts, ground and air patrols, countering intrusions and gathering intelligence on Warsaw Pact activities.
Output:
What numbers were the armoured cavalry units that replaced the policing duties of the German authorities?