Gen. Craig R. McKinley receives his fourth star from Defense Secretary Robert M. Gates and takes charge of the National Guard Bureau. He is the first four-star general to head the NGB and the first Air Force officer since 2002.
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.

