Task Force 141 and Sergeant Y/N, who had been part of their team for six months, found themselves in a dire situation during a mission to an abandoned research complex deep in enemy territory. The terrorists, aware of Y/N's classified past and the key knowledge she possessed, had targeted her specifically during the operation. With enemy forces closing in from all sides and their escape route compromised, the situation grew increasingly desperate.

Y/N didn't have time to explain her past to the team, as government protocols had kept it classified. However, this secrecy hadn't prevented the team from accepting her fully as one of their own. They fought with determination to protect each other, unaware that Y/N had already made a fateful decision.

Taking advantage of a momentary confusion in the enemy ranks, Y/N slipped into the complex's main control room and sealed the titanium security doors behind her. Before the rest of the team realized her intentions, the heavy mechanism engaged, blocking their access.

"Fuck, Y/N! Don't be silly, girl! Open the fucking door!" Ghost screamed in panic, immediately suspecting what the sergeant planned to do.

"Y/N don't you fucking dare do that! You hear me?!" Konig added, punching the titanium door senselessly in a desperate attempt to break through the impenetrable barrier.

Through the intercom system, Y/N's voice came through clearly despite the tension: "There's no time! Get out of here now! Otherwise, these rats will use me against you!"

The entire team paled as they watched through the thick glass panel beside the door. Y/N was placing explosives around the complex's main reactor, knowing the resulting explosion would destroy not only the building but also the advancing enemy forces. They desperately tried to force the door open, but the mechanism held fast against their efforts.

"Y/N, fuck, don't do it! As commander, I order you to open the fucking door!" Price shouted, his voice trembling at the realization of her plan. He couldn't accept this sacrifice, couldn't allow her to die for the team.

Soap joined Konig and Ghost in battering the door with everything they had, but their efforts proved useless against the reinforced titanium. "Y/N damn it! I swear that if you die, I will resurrect you and beat you with the snitch for it! Open that door! We can't fucking lose you! Not now and not like this!" Soap screamed, tears stinging his eyes as his voice cracked with emotion.

Gaz grabbed his head in绝望, recognizing the futility of their efforts. Y/N had always been stubborn, but he'd never imagined her determination would lead to this moment.

When Y/N finished planting the explosives, she moved to the glass panel and placed her hand against it, tears streaming down her face as she smiled sadly at her teammates on the other side. Through the intercom, she whispered, "Get out of here... You have to live. Please. Just go..."

Ignoring their continued screams and desperate attempts to reach her, Y/N stepped away from the door and moved toward the control panel. Seconds later, a massive explosion rocked the facility, throwing the team backward with its shockwave. When they regained their feet, the sight before them chilled their blood – the section of the building where Y/N had been was completely destroyed.

With the structure beginning to collapse around them, they had no choice but to evacuate. Boarding their extraction helicopter, they watched in silence as the research complex burned below them, smoke billowing into the night sky. No one spoke during the flight back to base, each lost in their own thoughts of grief and loss.

Back at Catterick Garrison, a symbolic funeral was held, and Y/N's name became synonymous with courage and sacrifice. She was remembered as the hero who gave everything to save her team.