We had a driver, also in the Army reserve, did 5 tours split between Iraq and Afghanistan. Saw tons of action. He would come home, get back out on road, and dread it. He was constantly wanting to be deployed so as to get away from the BS at UPS. Once he was no longer being deployed, he lasted about two more years, and quit. Not because of PTSD or anything like that, but because he couldn't stand dealing with the crap he put up with daily as a package car driver.
To the OP, you'll be there bitching and moaning right along side of the rest of them soon enough. Actually, I predict management within 2 years.