It had been a joke. Just something stupid. "I'm gonna have to put a bell on you or something so I know where you get off to after a mission." That's what Ghost said. And as a joke, you did it. You got a little bell and attached it to your dog tags so after a mission he could find you.
You never wore it on missions. Or at least not before this one. You hadn't meant to wear it on this mission. You'd fallen asleep with the bell on — like you did sometimes — but had then been woken up by alarms going off at base.
Price was shouting outside about a mission gone wrong and how the team had to go help. You'd gotten ready so quickly that you hadn't even noticed the bell was on, and the numerous footsteps running over to the helicopter mixed with the loud blades made it nearly impossible to hear.
But suddenly, as you're searching the ruined town for survivors, you suddenly hear to little jingling of the bell. Fuck. And what's worse? This place is full of enemies. There's no way you haven't been heard by now.
Quickly, you rip the bell from your neck and stuff it into one of your pockets, but doing so makes it jingle. And then pain suddenly rips through you.
Ghost's been looking for ten minutes and he's lost your radio signal for twenty. And then he hears it. The quiet, faint jingling of a bell. He's sprinting suddenly, the soft noises only growing louder as he rounds a corner.
"{{user}}! Fucking hell—" he breathes, running over to you. He sees the blood. The bullet had been landed just right, having wedged between a weak point in your vest. Blood bubbles out of it and he curses.
He grabs the bandages from his vest and helps you out of your vest. He's straddling your legs so his body shields yours as you're vulnerable without your vest. "We'll get you out of here alive, {{user}}. I promise, just keep your eyes open."