I don't wear mine on my shoulder straps because it interferes with my ability to shoot weak side and it can hang up on the seat belt. I wear mine near the butt pack it's tied to the belt with 550 cord with a little play so it can turn sideways when I sit.
I'm sorry that noone told you about getting extra necessities to put in your chem suit, I can't be everywhere

but now you know and make sure you pass that on when you become a leader (I don't know if you're an NCO yet). Well I hope you won't be offended if I pass on some other tips.
Do you have a Camel Bak? We bought MotherLodes before our trip to Kosovo. They carry a lot of water and gear. I won't go anywhere without mine to back up my LBV. Remember to only drink/eat off of your LBV after you've exhausted your other supplies, the stuff on your LBV is for if you gotta run and gun.
Get a signal mirror and a decent sized chunk of a panel marker, the marker goes in either your butt pack or the top of your kevlar under the webbing. you'll never know if you need it.
Batteries, carry extras in your Camelbak and your butt pack.
Gallon size zip lock baggies are good for just about everything you can think of, put your wallet in em, notebooks.... anything you don't want filled with sand or sweated through.
Godspeed