DAHLGREN, Va. – The Naval Surface Warfare Center Dahlgren Division (NSWCDD) will conduct range testing on Monday, Sept. 24, and Wednesday, Sept. 26, that may produce very loud noise in communities surrounding Naval Support Facility Dahlgren. The testing hours will run from 8 a.m. to 5 p.m. Access to the Potomac River Middle Danger Zone – as described in 33 CFR 334.230 – will be restricted during testing.