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Following the Gadsden Purchase , the United States Army sent Major Enoch Steen and four companies of the 1st U. S. Dragoons ( now the 1st U. S. Cavalry ) to occupy the former site of the Mexican Presidio de Calabasas .
 United States Army, 1st, 1st, Cavalry
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 United States Army, 1st, 1st, Cavalry