What country has colder regions? I hate heat.

I wouldn't trust a person that willingly gets a job where he can kill people for money. I think most people aren't able to actually do it in cold blood. I wonder if there are some scientific studies on military professionals or on military people that are experienced with killing other people.
I assume most people at war just shoot somewhere at the enemy's direction and hope they don't get killed. The special operators, on the other hand, are selected killers. The same is correct for attack drone operators that find joy in hunting and killing people.
Probably the studies would find they have a higher degree on the psychopathic scale than a normal person.