@Bee: I guess they are do-able, but your biggest challenge will be getting any support to do it. You are a military unit. Military units don't really have a say in foreign policy; they are there to be the instrument of such policies, not the decision-makers. You could find some ways to influence the decision-making of the higher echelon once you are deployed somewhere, but that ability is going to very limited. Only generals would have [i]some[/i] say on what gets done, but again, it's not really up to the military so a general's word is not always more important than that of the people in the capital. You could have some friends in high places, but that would only get you so far, and it depends on how important they are. Not to mention you'd need the support of many to change the course of major actions, not just a few high-ranking friends.

Being the Rangers, you are kind of at the mercy of higher powers. Sure, the Rangers are respected, and the word of their leader might mean something, but it's not nearly as important as that of the people calling the shots back in Shady Sands, or even that of generals. 

If you want to make big changes, you're going to have to be something with more weight. A special forces group doesn't really have much political power. You'd have to be a well-known, respected general to influence the actions of those truly in charge, but that would only go a certain distance. 

You can definitively make a new sheet, though, if you want to give your Rangers more connections, or if you want to play as a larger, more influential group, like a politically-savvy general in charge of an army group. That way, you have control of soldiers, but also get to talk to politicians who may follow your advice. Being a general, you may even be able to influence Ranger chiefs, but given the rivalry between Rangers and army regulars, that would be hard.