Additional U.S. troops have reached the Middle East, with more on the way. While the U.S. military hasn't specified a mission, the critical Strait of Hormuz remains closed to almost all oil tankers.
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Greg Myre is a national security correspondent with a focus on the intelligence community, a position that follows his many years as a foreign correspondent covering conflicts around the globe.
Leila Fadel is a national correspondent for NPR based in Los Angeles, covering issues of culture, diversity, and race.