8516
We know where they ' re at so we simply avoid them and if for some reason they do get off a lucky shot or they do see us , we have defensive systems on board the airplane to defeat their ammunition .
 We, they, we, them, they, they, us, we, their, the airplane, their ammunition
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:
 We, they, we, them, they, they, us, we, their, the airplane, their ammunition