Troops' signed hats may violate military rule
President Donald Trump made his first visit to a war zone, receiving an enthusiastic reception from many US troops there -- some of whom may have run afoul of military rules.
00:52 - Source: CNN
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US President Donald Trump signs a hat as First Lady Melania Trump looks on as they greet members of the US military during an unannounced trip to Al Asad Air Base in Iraq on December 26, 2018. - President Donald Trump arrived in Iraq on his first visit to US troops deployed in a war zone since his election two years ago (Photo by SAUL LOEB / AFP)        (Photo credit should read SAUL LOEB/AFP/Getty Images)
Troops' signed hats may violate military rule
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