^"New B-21 bomber named 'Raider': U.S. Air Force". Reuters. 19 سبتمبر 2016. مؤرشف من الأصل في 2018-07-04. اطلع عليه بتاريخ 2017-04-23. The stealth B-21, the first new U.S. bomber of the 21st century, is part of an effort to replace the Air Force's aging B-52 and B-1 bombers, though it is not slated to be ready for combat use before 2025.