The scope and timing of a potential Russian counterattack was still unclear as of Wednesday afternoon, the German defense minister said.
The Air Force's top uniformed leader said that planners need to consider vulnerabilities at military sites once thought untouchable by enemy forces.
The 18 Ranger instructors are not part of the 75th Ranger Regiment.
The service members were deployed in support of ongoing security operations at the southern border.
By Tara Copp, AP
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