Tucking in the shirt is in full effect at the Deid... that's for sure. Another thing, apparently, as an air crew member, you cannot wear a Balad Air Base cowboy hat, in you PT's, on your last day of deployment because, and I quote "You've not earned the right to wear that hat." No joke.
Also, didn't have much a problem with the sock nazi's at the Deid and open toe sandals were good to go, so long as they had a heel strap. At Ali Al Salem, or what many will refer to as BR-OKAS, you may untuck your PT shirt while working out.
BTW, don't ever put your sunglasses on your head. A fun game to play, regardless of deployment location, is to walk into a well crowded area and leave your shades on your head and have an over/under for how many seconds it will take for a brave Airmen, bored NCO or high flying officer to tell you to take them off your head... good stuff.
Last thing, I did get an explaination as to why I had to keep, actually retuck my PT shirt, whilst I was in the middle of working out. "It's the right thing to do and there are Airmen around... set the example." Classy stuff; I was inspired.