Gall's makes custom patches to your specs and you may want to check them out. I think there is a minimum order of 50 patches, so this may not be for you. I don't know if this is just for you or to outfit your entire department. But if interested, draw your patch design as you wish for it to appear and indicate the colors that want. Send it to Galls * 2680 Palumbo Drive * PO Box 54308 * Lexington, KY 40553. Or you can give them a call at 1-800-477-7766. With your design given to them, they will make a sample and mail it to you. If you like it they can take it from there and fix up your order.
Gall's also sells the Bianchi Accumold duty belt and accessories in OD green! These look great and would really look well with your cammies and be more rigid than a web belt.
If this Gall's stuff is more trouble than you want to deal with, check out US Cavalry at 1-888-888-7228. They make custom name tags and other things out of OD nylon, so perhaps they can make a nice little simple patch for you for less than Gall's.
Hope this was helpful. Good luck in your search.
---Charging Handle