Range testing at Naval Sea Systems Command Dahlgren means you may hear some booms during the day. Testing takes place from 8:00 a.m. until 5:00 p.m. and requires a high volume of rounds fired at a rapid pace which officials say produces continuous loud noise. The facilities are used by the military to conduct munitions testing and should be avoided while testing is in progress. If you have questions about the noise call (540) 653-8153