A U.S. Army plant in Oklahoma is ... designed to penetrate deep into earth and concrete before detonating, making it ideal ...

To date, more than 400 concrete bunkers in global hotspots have been ... the notice specified. "United States Army Central has a need for a significant, but indefinite amount of these bulkhead ...

The Busters focused on restoring Battery 519, which housed two 12-inch guns under 13 feel of concrete under the Great ... N.C., a former Army engineer during the war who recently toured the bunker.