A B-2 Spirit bomber deployed from Whiteman Air Force Base, Missouri, and F-22 Raptors from the Hawaii Air National Guard's 154th Wing fly near Joint Base Pearl Harbor-Hickam, Hawaii, during an interoperability training mission Jan. 15, 2019. (U.S. Air Force/Master Sgt. Russ Scalf)

The U.S. Air Force's $2.2 billion B-2 Spirit bombers, a key component of U.S. nuclear deterrence, are protected from "catastrophic" accidents by a $1.25 part designed by a group of high school students.

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