A firing squad is normally composed of several soldiers or law enforcement officers. Usually, all members of the group are instructed to fire simultaneously, thus preventing both disruption of the process by a single member and identification of the member who fired the lethal shot. The prisoner is typically blindfolded or hooded, as well as restrained, although in some cases prisoners have asked to be allowed to face the firing squad without their eyes covered. Executions can be carried out with the condemned either standing or sitting. There is a tradition in some jurisdictions that such executions are carried out at first light, or at sunrise, which is usually up to half an hour later. This gave rise to the phrase “shot at dawn”.

In some cases one or more members of the firing squad may be issued a weapon containing a blank cartridge instead of one housing a live round. No member of the firing squad is told beforehand if he is using live ammunition. This is believed to reinforce the sense of diffusion of responsibility among the firing squad members, making the execution process more reliable. It also allows each member of the firing squad to believe afterward that he did not personally fire a fatal shot–for this reason, it is sometimes referred to as the “conscience round”. While an experienced marksman can tell the difference between a blank and a live cartridge based on the recoil (the blank will have lower recoil), there is a psychological incentive to not pay attention and, over time, to remember the recoil as soft. In more recent times, such as in the execution of Ronnie Lee Gardner in Utah in the United States in 2010, a rifleman may be given a “dummy” cartridge containing wax instead of a bullet, which provides a more realistic recoil.

(Source: Wikipedia)