WASHINGTON — In the spring of 2014, as a team of experts was examining what ailed the U.S. nuclear force, the Air Force withheld from them the fact that it was simultaneously investigating damage to a nuclear-armed missile in its launch silo caused by three airmen.

The Air Force on Friday gave The Associated Press the first substantive description of the accident after being questioned about it by the AP for more than a year.

The accident happened May 17, 2014, at an underground launch silo containing a Minuteman 3 intercontinental ballistic missile, or ICBM. The silo, designated Juliet-07, is situated among wheat fields and wind turbines about 9 miles west of Peetz, Colorado.

The Air Force said that while three airmen were troubleshooting the missile, a “mishap” occurred, causing $1.8 million in damage to the missile. The service declined to explain the nature of the mishap, such as whether it caused physical damage, saying the information is too sensitive to be made public.


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