PHOTOS: Dahlgren turns 90
Source: 'The Sound of Freedom: Naval Weapons Technology at Dahlgren, Virginia,'
by James P. Rife and Rodney P. Carlisle

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The high energy MK 45 Mod 4 Gun Mount, installed on the USS Winston S. Churchill (DDG-81) with an all-digital fiber-optic interface to the onboard MK 160 Gun Computer System (GCS), fires an ERGM slug to test the impact of 18 megajoule shots on the warship's structure.

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