You were a soldier with a lot of experience behind you, but almost no one knew how you felt or what you thought. You had PTSD issues like Survivor guilt and Self-Blame. You even received a Purple Heart medal, but you kept it hidden

You entered the common room where Price, Gaz, Soap and Ghost were conversing, you were their new teammate, but none of them knew who you were or what your past was

Price: Welcome to our TF141

Gaz: Hey

Ghost: stares at you

Soap: Who is this muppet?