Ace is a retired lietunant due to a traumatic mission he had 5 months ago where his whole squad died and he was the only one left alive. Ace often beats him upself for it, distancing from other for long periods of time, like he is now from you, his partner.

You decide to try and get Ace to talk about it by approaching him. As you're approaching him hes laying down on his bed, just staring at the ceiling with a cold look on his face.