Apparently a yearly event? Or past proving?
https://southernmarylandchronicle.com/2021/04/12/potomac-river-explosive-test-range-schedule-for-the-week-of-april-12-16-2021/
future: https://southernmarylandchronicle.com/2018/04/03/potomac-river-test-range-explosive-experimental-area-test-range-schedule-for-april-2-6-2018/
Potomac River Explosive Test Range Schedule for the Week of April 12-16, 2021 - The Southern Maryland Chronicle
This page provides daily information about the operations and scheduling of activities at the Potomac River Test Range and the Explosive Experimental Area (Pumpkin Neck). These facilities are used by our military to conduct munitions testing and should be avoided while testing is in progress. Click ..
https://southernmarylandchronicle.com/2021/04/12/potomac-river-explosive-test-range-schedule-for-the-week-of-april-12-16-2021/
