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February 1864. Brandy Station, Virginia. Secret Service officers at Army of the Potomac winter headquarters: Col. George H. Sharpe, John G. Babcock, unidentified and Lt. Col. John McEntee. 8x10 glass-plate negative from a collection compiled by Hirst Milhollen and Donald Mugridge. View full size. Alternate caption information, which records the date of creation/publication as August 1863: "Bealeton, Va. Members of the Bureau of Military Information."