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.

Example input: Passage: Nearing London, Oliver encounters Jack Dawkins, a pickpocket more commonly known by the nickname the "Artful Dodger", and his sidekick, a boy of a humorous nature named Charley Bates, but Oliver's innocent and trusting nature fails to see any dishonesty in their actions. The Dodger provides Oliver with a free meal and tells him of a gentleman in London who will "give him lodgings for nothing, and never ask for change". Grateful for the unexpected assistance, Oliver follows the Dodger to the "old gentleman's" residence. In this way Oliver unwittingly falls in with an infamous Jewish criminal known as Fagin, the gentleman of whom the Artful Dodger spoke. Ensnared, Oliver lives with Fagin and his gang of juvenile pickpockets in their lair at Saffron Hill for some time, unaware of their criminal occupations. He believes they make wallets and handkerchiefs.
Example output: Who believes Fagin's gang make wallets and handkerchiefs?.
Example explanation: This question is based on the following sentence in the passage "He believes they make wallets and handkerchiefs". It evaluates the understanding that the pronoun "he" refers to name "Oliver". You can ask questions like this one about most pronouns in a paragraph.
Q: 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.
A:
What numbers were the armoured cavalry units that replaced the policing duties of the German authorities?