In the overwhelming majority of cases the injury is faked and so crutches or any other splint, bandage, etc. would not be used off set. For example, Dr. House does not actually have a limp when you see interviews with him. (He also has a British accent but that is another story.
) In rare cases, an actor might get injured accidentally on set and so truly require crutches. In this case the producers/directors/writers might have the actor pretend to get hurt in a scene just to allow them to use the crutches that they legitimately need.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.