Any sand color is good for ODS. Vehicles were quickly repainted at the port in Saudi as they came off boats. The paint was a locally bought sand color. It was not a Federal Standard color. They were not left in forest green.
On a side note, the USMC had not completed fielding M1A1s yet when ODS kicked off. They were loaned a Bn worth of Army M1A1s as they came off the boat in Saudi. All the tanks had the standard Army 6-shot smoke grenade launchers, not the later 8-shot USMC launchers. They had no USMC-specific parts on them. Also, I don't think any of their Abrams had mine rollers.