Shadow,
Not a pilot, nor are most of the people where I'm at. Just far enough away from the flagpole that the Sergeants Major have bigger things to consider than how someone wears his or her gun, so long as it's safe. Things have also changed in the handful of years I've been in. When OIF 1 kicked off, non-issue gear was still taboo in some units. As a Private, I brought my own sling to the fight so that if I was carrying my M16 and needed to do something with both hands it would rest across my body. My NCOIC ordered me to take it off solely on the basis that it wasn't an issue item. This meant that if I needed to do something with both hands, it was time to put the weapon down, sling it over my shoulder, or sling it across my back. The kind of mentality that says "inspection ready" should take precedence over "combat ready" is something I've been against all my years in the military, and one of the reasons I became an officer. If a troop comes to me, and he has basic competency with arms, and wants to try a new technique or piece of equipment, I'll ask him to show me. If it tests well, is safe, and it helps that individual shoot, move, or communicate more effectively, I'm all for it.
For the record, just so I'm not making myself sound like something I'm not, I spend a lot of my time behind a desk, though I get out with my guys as often as I can just for sanity's sake. However, I do have the honor and privelege of leading some very high speed men and women who put it on the line on a daily basis. Prior to leading them here I was responsible for their training. I approach both with an incredibly serious mind, but also an open one. While there will always be something to bitch about, and much of it will be legitimate, I must say that certain parts of the Army have become more receptive to this thinking in recent years; the thinking that if something doesn't work in combat (equipment or technique), it's not worth practicing in training, and that if something does work but there's more effective ways to accomplish the same end, let's do it that way. The sling issue I had above is not something most units will gripe about now. In fact, while I had an M16 with an M203 grenade launcher in OIF 1, I now have an M-4 next to me with a light, a "gangster grip," an AimPoint that I could swap out for an ACOG if I so wanted, and a sling that I thought would be best for the work I do. Such a setup would have caused a lot of the more straight-laced NCOs and Officers to lay eggs not even 10 years ago.