First regular Aerospace Expeditionary Force rotational cycle begins. The full cycle is 15 months, divided into five three-month periods. During each of these, two of the 10 Aerospace Expeditionary Forces will be vulnerable to deployment.
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.
