There is too much desolate, wide open desert without prying eyes to conduct an arms deal.
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Why would you want prying eyes to conduct an arms deal or any other illicit deal?
At any rate, he looks like some sort of CIA asset to me, and likely involved with human and drug trafficking. That often means arms going one way, and humans drugs coming back.
Then why do the exchange on the 32nd floor of a hotel instead of out in the desert. Hit on the Saudi prince.