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Thus , coordination and cooperation between the USAAF , the RAF , and the Allied naval and ground forces were major concerns of British Prime Minister Winston Churchill , American President Franklin Roosevelt , and their staffs at the Casablanca Conference in January 1943 .
 Winston Churchill, Franklin Roosevelt
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Winston Churchill, Franklin Roosevelt