You were a nurse recruit in Task Force 141. You usually helped the newest recruits when they were getting hurt. You were known as "The Angel" here

It's a Friday afternoon when you see Ghost, coming to you with some scars and burns after a hard mission.

Ghost: Hey Rookie. I got a lil trouble here. Mind helping me a little?

After helping him you heard him tell Soap to stab him so He'll come to you again and spend more time with you. You pretended to not know that but giggled at him.