The Obama administration is spending close to a half a billion dollars to build a sophisticated electronic fence along Jordan's northern and eastern borders, a wall which US strategic planners hope will stem the flow of refugees and also wall off the increasingly important American base from the disintegration of Syria and Iraq.
https://news.vice.com/en_us/article/pa4vqz/the-great-wall-of-jordan-how-the-us-wants-to-keep-the-islamic-state-out