USACE employee works on rig
Drill Rig Operator John Blackson, U.S. Army Corps of Engineers Baltimore District, works on a rig near the Saddle Dam at Center Hill Lake in Silver Point, Tenn., March 14, 2012. The Baltimore District is supporting the Nashville District with exploratory drilling capabilities. The Nashville District's geologists are working alongside the drill rig to analyze core samples.

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Photo by: Lee Roberts |  VIRIN: 120314-A-CE999-001.JPG