First, I'm not a SAR guy, I just did a lot of research about it when I was younger, and knew people.
You typically do not need to have a degree to volunteer for any of the groups I listed. Volunteer Firefighters do get training for all sorts of things, so it's good to get into if it interests you. Volunteer EMS gets training as well and most FD's will cross train you for both.
As for the military to help pay for college, they do, but remember, contrary to what the world wants you to believe, you do not need a degree to make a decent living. I don't have a degree and make about 2.5x what my wife does with her degree. Not trying to talk you into/out of the military or college, but do your research on all fronts.