USAF formally retires the T-37 Tweet training aircraft during a ceremony at Sheppard AFB, Tex. The T-6A has replaced the T-37, which served for more than 50 years as part of the Air Force’s undergraduate pilot training 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.
