188736
Plot summary Two U.S. Army pilot s , in the early days of military aviation , in the mid-1930s , in an era of open cockpit s and biplanes , are always trying to do each other , in a friendly rivalry .
 U.S. Army pilot
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 U.S. Army pilot