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Since the project began almost two years ago , corps volunteers have focused on African American troops , preparing records in time for the unveiling in Washington this year of a special memorial to black soldiers who fought in the war .
 African American, Washington
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, else, organization, person 
Text: {0} 
Answer:
 African American, Washington