Assists

not sure how it works in call of duty never played it, but i played another game with assist kill type thing, if you do damage so someone but dont finish them and someone else does, you get assist point, these are saved and show next to your k/d, example i have 50 kills 50 deaths 5 assist it show 50(+5)/50 kills/deaths and assist also count as a kill for the money/xp rewards