[['[TABLECONTEXT]', 'NAME', 'MG William A. Mann'], ['[TABLECONTEXT]', '[TITLE]', 'Chief of the National Guard Bureau'], ['MG William A. Mann', 'TO', 'November 26, 1917'], ['MG William A. Mann', 'FROM', 'October 26, 1916']]
MG William A. Mann was Chief of the National Guard Bureau from October 26, 1916 to November 26, 1917.