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U . S . Army ' s 7th Cavalry is in the forefront of U . S . troops since they first left Kuwait and crossed directly into the Iraqi desert .
 U . S, Kuwait, Iraqi, U . S . Army, U . S . Army ' s 7th Cavalry, U . S . troops, they, the Iraqi desert
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: organization, person, geographical social political, vehicle, location, weapon, facility 
Text: {0} 
Answer:
 U . S, Kuwait, Iraqi, U . S . Army, U . S . Army ' s 7th Cavalry, U . S . troops, they, the Iraqi desert