I recently joined my local Search and Rescue team. The opportunity popped up at just the right time for me and combines many things that I'm interested in while being of service to my community. The application process was fairly rigorous (under 10% acceptance rate) we then went through intensive training in a wide range of skills before being able to respond to calls. The team has a lot of cool toys, trains to high levels to maintain their certifications, has types of access to areas of the county that the public doesn't, is on call 24/7, and directly deals with the life and safety of individuals and the community at large.
Depending on where you live, your local team might be something for you to look in to.