Union Jack - your profile suggests you may be lot closer to the truth than others but, at the time, I heard that Edward coped well with all the roughy toughy and fitness/endurance stuff in training but simply could not get his head around being a leader of men intent on aggressive attack and killing when required.
Is that all BS too?
In the Army he would have succeeded in a Corps perhaps but not the Parachute Regt or their like etc.