Definitely joining. It has been a while since I participated in role-playing. I agree with Drake Baku. 

I would like to be a lieutenant. Not too much of a big deal but just enough to not be just an average guard. Good with the sword but not completely mastered. Can easily take on an average guard on one to one combat depending on the skill level. As the scenario goes where there is a group of enemies, he would try to out smart them. He is young for such a rank. In his late teens. Trusted and witty. Feel free to ask any more questions if needed.