Okay, I looked on the net, and most things related to the subject are variations of each other,so I copied it, and here it is. not a great piece to quote, but its all about the same. It seems that the blank cartridge was not mandated, or at least optioned case by case.
Quote from the net: "Execution by firing squad is a method of capital punishment, especially in times of war. A firing squad is a group of people (usually soldiers) who are ordered to shoot at the condemned person simultaneously.
No single member of the firing squad can save the condemned person’s life by not firing, reducing the moral incentive to disobey the order to shoot (see diffusion of responsibility).
Executions are usually carried out with high-caliber rifles to facilitate a quick death. The condemned may be seated or standing but is usually restrained. The condemned is often hooded or blindfolded.
In some cases, one member of the firing squad is issued a gun containing a blank cartridge instead of one with a bullet, without telling any of them whom it was given to. There are two theories supporting this practice. First, each can hope beforehand that he will not be one who contributes to the killing. This is believed to reduce flinching and to make the execution proceed more reliably. Second, it allows each of the soldiers a chance to believe afterward that he did not personally fire a fatal shot. While an experienced marksman can tell the difference between a blank and a live cartridge based on the recoil (the blank will have much lower recoil), there is a significant psychological incentive not to pay attention and, over time, to remember the recoil as soft.
The firing squad is commonly used to execute spies. It is often considered a particularly honorable method of execution, and as such is intentionally not used for war criminals, who are often hanged–a penalty associated with common criminals. Firing squads were, however, used by some countries to execute war criminals after World War IIWorld War II was the most extensive and costly armed conflict in the history of the world, involving the great majority of the world’s nations, being fought simultaneously in several major theatres, and costing tens of millions of lives. The war was fough, most notably by PolandThe Republic of Poland a country in Central Europe, lies between Germany to the west, the Czech Republic and Slovakia to the south, Ukraine and Belarus to the east, and the Baltic Sea, Lithuania and Russia (in the form of the Kaliningrad Oblast exclave) t and RussiaThe Russian Federation ( Russian: , transliteration: Rossiyskaya Federatsiya or Rossijskaja Federacija , or Russia (Russian: , transliteration: Rossiya or Rossija , is a country that stretches over a vast expanse of eastern Europe and northern Asia. With.
The method is also the supreme punishment employed by courts martial for crimes such as desertionDesertion is the act of abandoning or withdrawing support from someone or something to which you owe allegiance, responsibility or loyalty. In a military unit, it is the act of leaving the unit without intention of returning. In the U. military, a person such as in the execution of Private Eddie SlovikEdward Donald “Eddie” Slovik ( February 18, 1920 January 31, 1945), a private in the United States Army during World War II, was the first United States soldier to be executed for desertion since the American Civil War. While 21,049 soldiers were sentence by the U.S. Army in 1945Events January January 5 The Soviet Union recognizes the new pro-Soviet government of Poland. January 7 British General Bernard Montgomery holds a press conference in which he claims credit for victory in the Battle of the Bulge. January 12 World War II: (Slovik was the first US soldier executed for desertion since the Civil War). It has also been employed for crimes such as mutiny as well as ordinary crimes carried out by soldiers such as murder or rape.Execution by firing squad is distinct from other forms of execution by firearms such as the “single shot from a handgun to the back of the neck” practiced by the People’s Republic of China."
So, I guess barring a few central points, there was alot of leeway in how an execution by firing party could be conducted. I’ll see if the U.S. military had a “drill” for the practice, and post it if I find it.