142276
The film is set in modern day Los Angeles and follows a retiring Marine Staff Sergeant played by actor Aaron Eckhart who must go back into the line of duty to lead a platoon of U.S. Marines , isolated US Army troops and a US Air Force technician during a global alien invasion .
 Los Angeles, Aaron Eckhart, U.S. Marines, US Army, US Air Force
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Los Angeles, Aaron Eckhart, U.S. Marines, US Army, US Air Force