82097
The pose is commonly seen in photographs of members of the military , with a number of American Civil War photographs showing the pose , or indicated by three open buttons on a tunic .
 American Civil War
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 American Civil War