On March 25, 2019, the U.S. military tested its Ground-based Midcourse Defense System for shooting down potential missiles coming from overseas. The test occurred at 10:32am local time at Vandenberg Air Force Base in California.
The concept is sometimes described as “shooting a bullet with another bullet.” This type of effort to shoot down ICBMs with other missiles has been debated for decades, most controversially in the 1980s during President Ronald Reagan’s plan for “Star Wars,” when it would have been space-based, as opposed to today’s ground-based system.
From the U.S. military’s description:
A test of the nation's Ground-based Midcourse Defense system, was conducted from North Vandenberg Monday, March 25 at 10:32 a.m. PDT by 30th Space Wing officials, the U.S. Missile Defense Agency, and U.S. Northern Command.