There are two olive colors (637 & 653). Both colors are officially recognized as Olive; however, they are different. Color Code 637 is Olive; whereas Color Code 653 is Olive Brown (somewhere between Baby Poo & diarrhea). My truck is 653. It is the perfect camou. I like the color. Luckly it isn't a scratch-n-sniff paint...or at least I think that smell is the exhaust.