The Air Force implodes the last Minuteman III missile silo under START reductions at Grand Forks AFB, N.D. It is also the last silo at Grand Forks.
The U.S. began extensive air and artillery strikes against Islamic State group targets in Syria on Dec. 19 in retaliation for the killing of three Americans on Dec. 13 by a gunman affiliated with ISIS, U.S. officials said.

