One desert night on a Marine base outside Basra, I chatted with an Egyptian interpreter hired by the US military. Knowing that Cairene Arabic is vastly different from that of Southern Iraq, I asked him if he had any trouble understanding the local dialect. He shook his head. “I have no idea what they are saying. I have a much easier time understanding you.” His English was excellent, which is presumably why he got the job, but his comprehension of Basrawi Arabic was almost nonexistent. But Marine officers, who inevitably spoke no Arabic, depended on him to explain what the locals were trying to tell them. Since the interpreter just made up what he thought his bosses wanted to hear, the Marines were operating with negative intelligence.
As good a synopsis of the last 60 years of this country's foreign policy, as any.