The X-37B, USAF’s first unmanned re-entry space vehicle, returns to Earth, following its maiden voyage of 220 days, during which time it conducted risk reductions and reusable space vehicle technology concept development experiments.
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.
