12. Army Corps of Engineers

Made up of soldiers and civilians, scientists and specialists in an enormous variety of fields, the US Army Corps of Engineers was created over 200 years ago by Congressional mandate to respond, in peace and war, to the nation's engineering needs. The world's premier engineering and research and development agency, the Corps has blown up, excavated, grated, dredged, and remolded the shape of our continent as we pushed to expand the nation and harness the forces of nature!