In this Sunday, Dec. 29, 2019, photo taken from a helicopter shows Ain al-Asad air base in the western Anbar desert, Iraq. The Pentagon said Friday, Jan. 24, 2020, that 34 U.S. troops were diagnosed with traumatic brain injuries suffered in this month's Iranian missile strike on an Iraqi air base, and that half of the troops have returned to their military duties. Seventeen of the 34 are still under medical observation, according to Jonathan Hoffman, the chief Pentagon spokesman. (AP Photo/Nasser Nasser) **FILE**
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