The sexual assault should be more than enough thats a serious cause of ptsd, all you need is records. As far as proving it for combat i know what i did was just show them video coverage and they bought it right out so if you have that kinda proof you can. I know my unit took alot of casualties in afghanistan so if ur s did too it wont be to hard to prove. As far as the tbi what i was told is that the tbi itself doesnt stay with you but the after effects like i told you are what you get, yes you had a tbi but do you now have the after effects.