The U.S. Air Force tested a previously banned ballistic missile over the Pacific Ocean on Wednesday, according to an announcement from the Department of Defense.

The Pentagon described the weapon as a “conventionally-configured ground-launched ballistic missile,” and analysts say that the projectile likely would be barred under a Cold War-era arms control agreement that the U.S. left over the summer.

The agreement — the Intermediate-Range Nuclear Forces (INF) Treaty — bans ground-launched ballistic missiles that can fly more than 500 kilometers.

According to the Pentagon, Wednesday’s launch traveled farther than the INF Treaty would have allowed.

“The test missile exited