I know what you mean about the heat. I lived in AZ for 20-some years. Riding in the summer, when you're stopped in endless traffic, the heat must be at least 130+ by 11 a.m., as it just radiates off the asphalt like an oven. In fact, I wouldn't be surprised it it was closer to 150 at times. You're right it's almost impossible to ride with any form of protection.
When I was a 19 year old kid, I got my first liter bike (no never downed it- I too started out riding, a bit younger, around 13, and then got my own street bike a 250 cc at 15- which is the legal age for getting a riding permit in AZ). To be honest, I had ridden for years without anything but a helmet and gloves.
I lived in Tucson, AZ where there's a road called Catalina Highway, which is 28 miles of twisties, everything from 40 mile per hour chicanes to triple digit straight aways (or so I've watched). A round trip up and down the mountain is 48 miles. It's funny, by the time you get back down, on a litter bike the fuel light is already on. It's the longest mountain road in the United States, I believe, and the pavement is pristine. I've probably been up that mountain over 1,000 times, easily. All of the turns are "engineered." I never went above the speed limit, naturally. But sometimes my speedometer would malfunction and I'd see triple digit speeds, while climbing from the 2,500 desert to the cool mountain air at 8,500 feet.
When I grew some brains, and Joe Rocket was just starting out, I bought one of their mesh jackets with CE protection. It's not leather, but it's enough to keep you in one piece, unless you're going super nuts.
They still sell them and they're under $150.00, if I remember correctly. Try to wear something bro. You just never know. It might not be a car, it might not be your riding, something as rare as a blowout, could send you to the pavement. You just never know.
I've worn the jacket in ambient temperatures of 115- not counting what is reflecting off the pavement and I've had no trouble. freezing a camelback and staying hydrated also helps.
I do confess that riding with a leather jacket in 105 degree weather is almost impossible and the concentration that you loose from overheating can be dangerous in its own right, as it instantly saps your reaction time and your ability to stay safe.
Either way, welcome to the forum! A HUGE Thanks for your service. It's an honor and it's very much appreciated. Stay safe on your bike and when be careful if you serve another tour over there. Hell, be careful in training!