I honestly believe that to rank up we should undertake some type of quest or mission instead of just paying for a new rank with seals...I do understand that this is a game and should be removed from realism as much as possible...but I do think that some things should reflect real life to a certain degree...in the real world military we use our pay to buy new gear and or equipment to be able to continue doing our job...we get promoted to a new rank after a certain time and after performing certain test to determine if we are ready for the new rank...