Adm. Timothy J. Keating takes command of NORAD and US Northern Command, becoming the first Navy officer to hold the NORAD position, which traditionally went to the Air Force.
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.
