Ten minutes ago the sound of live ordnance echoed in the distance. Now the soundtrack has changed to a mix of humming turbo-diesel, minor rattling, and shouted expletives of amazement. We’re at the Aberdeen Test Center (ATC), located on the 73,000-acre Aberdeen Proving Ground Army base in northeastern Maryland. The sounds are from 25,000 pounds of tactical vehicle hurtling across ATC’s Perryman No. 3 off-road course, a half-mile-long super-whoops section that would make Finland’s World Rally organizers jealous. We launch off an eight-foot-high mogul at about 30 mph, landing hard enough to break anything we’ve ever driven. But the truck just brushes it off and charges toward the next berm.