“I watched a lot of documentaries on post-traumatic stress and a lot of army documentaries about the training programs and some of the extreme sort of circumstances that some of those guys that are training to be Navy SEALs and some who are a part of it go through. I was trying to understand what it is, what it means for someone to be desensitized, to no longer question hurting something. I did as much research on all that stuff as I could in order to kind of know what that was like. And then my stepdad actually has Alzheimer’s, so there were parts about watching and studying that kind of disease, also, observing people like that that kind of helped me a little bit.”—SEBASTIAN STAN