The Air Force and industry partners successfully launch the first Advanced Extremely High Frequency satellite (AEHF-1) aboard a United Launch Alliance Atlas V rocket operating from Cape Canaveral AFS, Fla. AEHF is replacing Milstar communications satellites.
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.

