The U.S. Missile Defense Agency (MDA) on Monday conducted a successful test of its Ground-based Midcourse Defense (GMD) system designed to counter intercontinental ballistic missile (ICBM) threats from Iran and North Korea.

Monday’s test was the first time the GMD attempted a salvo engagement, with two interceptors intended to strike an ICBM-level target fired from 4000 miles away.

“This test was the first salvo engagement of a threat-representative ICBM target by two Ground Based Interceptors (GBI), which were designated GBI-Lead, and GBI-Trail for the test,” the MDA said in a press release.

“The GBI-Lead destroyed the reentry vehicle, as it