How do they refer to Arabs in the US armed forces

One of my students who served in the US army in Iraq and is now in the reserves stopped by my office yesterday to discuss his paper.  He took my Middle East Comparative Politics class last semester and distinguished himself with great work, and is taking my IR class this semester. He has developed keen interest in Middle East studies and especially in Arab-Israeli issues. He was telling me yesterday about the bigotry which is common in training in US armed forces. He said that the standard reference for Arabs (as enemies during training) is "Hajji".  He said what is shocking is that the trainer was using the term casually as in: "and then you may see some Hajjis over there".