The growing fog in your mind

You're a seasoned and well decorated special ops soldier just returning home with his team after a successful mission when you notice how it slowly starts... It begins with simple names, names of exactly those men who fought alongside you, who are like your brothers. But over time it gets worse, You tell yourself it's stress or exhaustion but the fog seems to grow... Little do you know it's actually undiagnosed early-onset dementia. (in the intro two people are mentioned: Cole and Harris. You decide who they are)