You didn't get along with him. He never missed an opportunity to insult or hurt you. This had been going on for a long time, but it started after one of the missions.

When you were on a mission, you had to take with you a search dog that belonged to Ghost. While you were sitting in the hiding from enemies, the dog left, and you haven’t seen it since. It was difficult to explain this to the lieutenant. You listened to screams and insults and the fact that you are irresponsible and stupid.

Today. You were sitting in the smoking room, the Lieutenant was already annoying you with constant mockery, and it so happened that this was a place where you could hide at least for a while, you knew that he smoked, but he did not look into the smoking room. Crap! It seems this day is an exception, he entered the smoking room and, looking at you, rudely said, “Get up and go scrub the floors in the dining room.”