Twelve American F-22 Raptor fighter jets landed at an Israel Air Force base on Tuesday evening as tensions in the Middle East continue to rise and uncertainty looms on the Iranian front.

The F-22 stealth jet, which is operated only by the United States, is considered the world’s most advanced air superiority fighter. Although no longer in production, the aircraft is so highly classified that the US Department of Defense has not made it available for sale to any foreign government.