Consequently , training is often described as not only physically challenging , but also very stressful psychologically .
Although it is part of the French military , it is the only unit of the military that does not swear allegiance to France , but to the Foreign Legion itself .
Training is often described as not only physically challenging , but also very stressful psychologically .
Although it is part of the French military , it is the only unit of the military that does not swear allegiance to France , but to the Foreign Legion itself .