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Did you fill the trans when cold? This can cause over filling.
Change both of your filters...then check again. It could be a plugged filter restriction.
A rebuilt HMMWV converted to "civilian" specifications (FMVSS standards) and then resold...
This could happen, but they would definitely not be cheap. They also wouldn't be HMMWV's anymore....more like Hummers.
The service brakes are the smaller pots on the rear axle. They look like the fronts, just a little bigger. DP16 is the diaphragm size.
The spring brakes are the bigger pots on the rear axle. They have the caging bolt assembly on them. I would get a professional to help you if these are...
Imagine if the valve were plumbed backwards. Normally, in the off "out" position, it does not direct air to the spring brakes. In the "in" position, it does. In your case, it's working (overriding) the spring brakes when you press it in. So...it's working.
What people are talking about is...
As searls84 said above...
It seems your fault is with the parking brake lever or switch. As you've explained it, the "spring brake override" is, in fact, working correctly.