They probably do, every day, we just don't hear about them. Like Bush said, we won't be aware of most of the action. Bombing a building in Fallujah would attract attention, so would have to be acknowleged.
Hey Mr. Wilson...Were you looking for yellow cake or the yellow gold in your investment portfolio?
Good point. What the administration should do however is periodically provide estimated results of number killed in covert attacks if they are occurring. This would help them gain support as well as help demoralize the enemy.