This is the first time I've noticed this thread.
I'm a heavy equipment operator for a local municipality; specializing in water and sewer infrastructure. I've been at it for about 5 years and it's getting old. At only 31 years of age I've got arthritis in my left shoulder and two bad knees that need replacing. In my line of work being a "heavy equipment operator" means you get as much time on the smart end of a hand shovel as you do in the seat. You may get lucky and find a job that gives you 10 hours of seat time a day, but that's a good way to get fat. The alternative is to be like me and get a little bit of it all (including driving commercial trucks) but I go home sore and tired at the end of the day.
I'm lucky that I went to college and got two bachelor's degrees before I started working. I've got those to fall back on and now that my 31 year old body feels like a 61 year old body I'm looking for an exit strategy. With a little luck I'll be back in school for a masters degree in a medical field within the year.
Good for you for having motivation, direction, and ambition. If you keep it up with those three attributes you'll do great in life. Please don't rule out school for something beside equipment operating. Think of degrees that will keep you happily employed- any of the trades, anything in the medical fields, (nursing, etc). There's nothing wrong with wanting to be an HEO but be open minded to other paths.