If you're writing in both past and present tense, the readers will probably get confused. But I think it's different when they're thinking and the story is past tense. Other writers have done this before and it's actually very annoying.
For example - " He could swear she was standing right in front of him, but something seemed unreal about her. 'Was she for real?' he wondered. See what I mean?
If his thoughts are past tense, it kind of ruins the moment and it's less interactive. You can write in past tense but keep the thoughts present tense, if that's what you meant by writing in both tenses. It keeps the readers more involved and less of an audience.
Example of what I'm talking about - " She stared hotly at the mirror, wishing the reflection would somehow change. "Am I pretty at all"? She thought to herself.
" Sounds more interactive, doesn't it?
That's fine. It would ruin the moment if they were both in past tense anyway.
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.