Delta Force used to train for hostage rescue by using other Delta Force people as the "hostage" which was being held as a human shield by the target dummy. Each guy had to take turns being the hostage and having .45ACP rounds flying inches past his face.
Then, the inevitable happened and someone got killed, so they stopped doing it.
Edit: Pic so I don't get yelled at:
Belgrade burning. Kosovo War, 1999.