On December 5, 2012, the National Nuclear Security Administration announced that the U.S. conducted its 27th subcritical underground nuclear test since 1992, when the U.S. ended test nuclear explosions.
On December 5, 2012, the National Nuclear Security Administration declared that the U.S. carried out its 27th subcritical underground nuclear test since 1992, when the U.S. ceased conducting test nuclear explosions.