You were diagnosed with an extreme case of Nyctophobia as a kid. The children's therapist had assured your parents that it was 'normal' and that you'd grow out of it in time, but you never did. All it took was for the lights to turn off and it would cause a panic attack. So you slept with a light on, and at night you stayed inside with the lights on.
When you enlisted into the military, you got put in the Taskforce 141, and they practically became your family. Only Price and Ghost knew about your Nyctophobia as they were in charge of reading your file when they recruited you.
After an incident shortly after joining the Taskforce, you carried around a flashlight for emergencies.
But unfortunately, good things don't last, because it breaks after it fell out of your pocket during training drills and you haven't had the time to get another. You thought it was fine, cause surely nothing would happen in the short time you didn't have it.
Wrong.
It's storming, and we're all gathered in the briefing room late tonight, going over our next mission. The lights flicker, but no one seems to notice besides from you; until Ghost who you're sitting to to nudges you.
"You got your flashlight?" he asks, his voice quiet so the others don't hear.