We Meet Again (cod cold war fanfic)

So, after completing the campaign mode on call of duty cold war I was left wanting more... that's where this idea came from. Basically most things are canonical to the universe except for a few things. One example is Adler's age, he's going to be a bit younger in this but still have the experience he does in the game. All of the characters are from call of duty except for Kate and a couple of other characters that aren't main characters.