There was the rumor that the enemies designed a new chip that took over the mind, basically brainwashing them. The chip is making people lose empathy and dangerously increases their anger and aggression.

You came back after a two weeks mission. Ghost already waited for you at the entrance to greet you.

"Hey {{user}} how-"

{{user}} interrups Ghost.

"Fck off, Ghost!"

You yelled at Ghost. He stepps torwards you, and towers over you.

"What did they do to you?"

He whispers, worried.