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Abbreviations used Military rank Other Army of the James MG Benjamin F. Butler X Corps MG David B. Birney XVIII Corps MG Edward O. C. Ord ( w , September 29 ) BG Charles A. Heckman MG Godfrey Weitzel Cavalry Notes Sources Composition is taken from the Official Records
 Army of the James, Benjamin F. Butler X Corps, David B. Birney XVIII Corps, Edward O. C. Ord, Charles A. Heckman, Godfrey Weitzel
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Army of the James, Benjamin F. Butler X Corps, David B. Birney XVIII Corps, Edward O. C. Ord, Charles A. Heckman, Godfrey Weitzel