Yeah Grits, this does a handful of things, from getting people used to playing patiently to creating chemistry between the players who are doing this together. The whole idea behind the weapon badges is to subliminally help and make people realize that they can have a killer k/d ratio without even knowing it at first.
Once a player gets through the Marksman badge they should be feeling comfortable enough to know that patience is key and setting up a perimeter on any map becomes that much easier when everyone knows what to do. I never think or stress about my kills or deaths, then all of the sudden I look at my score and I am doing great.