Once you attain Colonel at level 45, your rank stays the same.
Beyond rank 45, players earn service stars to add to their Colonel rank, up to a maximum of 100. Therefore, there are a total of 145 levels/ranks to achieve in Battlefield 3
You get a Service Star for every 230,000 points beyond rank 45. The Colonel Eagle rank 45 emblem starts off silver color, and at Serv Star 51, you get gold/bronze trim, and that increases until Serv Star 100, when it turns all gold/bronze...
Medals...http://www.youtube.com/watch?v=1kwJGDyN ... re=related