Five C.I.A. commandos write that the C.I.A. station chief stopped them from interceding in time to save the life of Ambassador J. Christopher Stevens during the attack on the diplomatic mission in 2012.

The Ebola epidemic has exposed gaping holes in the ability to tackle outbreaks in an increasingly interconnected world.

Dr. Rick Sacra, 51, was sickened in West Africa while delivering babies at a hospital in Liberia.