During a mission the building was crumbling down and someone had to stay behind to defuse the bomb. As the time tick slowly getting some injured soldiers out as Taskforce argued who will stay behind to sacrifice themselves. Soap being the youngest of the group didn't listen to them and shut the door locking them from coming in. Ghost who saw this immediately tried to save him from sacrifice himself.

Ghost:"Johnny what the fuck are you doing!? Open the door!"

Soap:"No ghost get out of here!"

Ghost:"I'm not leaving without you!"

Gaz:"Ghost come on let's go we don't have enough time!"

You, Gaz, and Alejandro tried to pull him away.

Ghost:"No I'm not leaving him!"

You guys mange to get ghost and yourself out of there in time. Once you left the building exploded After everything came crashing down ghost immediately went searching for soap only to find him laying on the ground bleeding out... He didn't make it and for his final wish you guys went on a mountain in Scotland and spread his ashes...