ABERDEEN, MD — Aberdeen Proving Ground will hold military weapons testing April 21-25 from approximately 8:30 a.m. to 6 p.m. Noises can be heard in areas off the installation during the testing ...

The cannon was designed to fire a 15-kiloton, 850-lb W9 nuclear artillery shell, the first of its kind, up to 20 miles. The entire system and its artillery shell began testing at Aberdeen Proving ...