While I understand the security implications, I can only imagine what Harry and his troops feel about his being left behind.
Here is a young man that wants to lead his men in this fight, and now General Dannatt says "no." Via the Associated Press:
...Gen. Sir Richard Dannatt, the army chief of staff who recently traveled to Iraq, said the changing situation on the ground exposed the prince to too much danger. Media scrutiny of Harry's potential deployment exacerbated the situation, he said.
"There have been a number of specific threats, some reported and some not reported, that relate directly to Prince Harry as an individual," Dannatt said. "These threats exposed him and those around him to a degree of risk I considered unacceptable."...
Hopefully, this is a ploy to allow him to lead his platoon in Iraq and keep the media and the terrorists from knowing where he is.