Depends on if they use regular mayo or light. They probably use regular, so I'd expect it to be between 500-600 calories... Plus whatever you add on the sandwich besides the the tuna mix. More.
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.