The United States Air Force sent a stealthy surprise over the Atlantic Ocean earlier this week.

Two B-2 stealth bombers will be conducting training exercises in the U.S. European Command area of operations for an unspecified amount of time. The duo of birds was sent to RAF Fairford, a British air base west of London, the Military Times reports.

According to CNN:

The mission for the pair of stealth bombers, the Air Force said, is to conduct flights in Europe and to become familiar with air bases and operations in the area.

“This deployment of strategic bombers provides an invaluable opportunity to strengthen and improve interoperability with our allies and partners,” said Adm. Cecil Haney, commander of U.S. Strategic Command, in an Air Force press release. “The training and integration of strategic forces demonstrates to our nation’s leaders and our allies that we have the right mix of aircraft and expertise to respond to a variety of potential threats and situations.”

The B-2 has the capacity to carry up to 40,000 pounds of weapons, including conventional and nuclear weapons, precision-guided munitions, gravity bombs and a range of maritime weapons, according to AirForce-Technology.com. The bomber is the only stealth aircraft capable of carrying such weaponry.