Peter B. Teets, acting Secretary of the Air Force, resigns. He has served as undersecretary of the Air Force, director of the National Reconnaissance Office, and DOD executive agent for space since late 2001 and, in addition, assumed the role of acting Secretary on Jan. 20, 2005.
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.

