Serving in the military is a great way to learn new skills and potentially see the world. However, many people also opt to begin taking college courses while still in the military so it will not take them as long to earn a degree after they are discharged. While taking college classes as a member of the military can be a little more challenging than being a traditional student, it is completely possible.
If you want to be an HVAC tech, you can't just jump into it and start working on the machinery. You are going to need to get some training to do it right. Otherwise, you are going to end up not getting a lot of work. So what do you need to do in order to get that training?
You are going to need to have some kind of proof that you have finished high school.