8787
He ' s embedded with the U . S . Army ' s 11th Attack Helicopter Regiment .
 the U . S . Army, He, the U . S . Army ' s 11th Attack Helicopter Regiment
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:
 the U . S . Army, He, the U . S . Army ' s 11th Attack Helicopter Regiment