I have completed all of the missions in the following roles: Rifleman,Sniper, and Grenadier. I only have one last mission in the outo-rifleman role, but I'm not sure if completing that last mission will give me a new role. I have also gained the rank of First Sargeant, so it can't have anything to do with rank.Please help me!!! Here is a bonus tip for anyone reading this: To gain a lot of experience, just go through the obstacle course and after about 12 times you should go up a rank. Thanks in advance!