If been going in to the emblems that you can make and dear lord that takes a lot of time to get it right.
When i looked at when and how you unlock stuff of the emblems i came a cross this and this helps you out.
I thought that a lot of players with had a really good emblem just had good things going but the truth is there are just using this.
Hope it helps you out, good luck and see you in game
How to import custom Battlefield 4 emblems