Yes, it was in Iraq. I saw one north of Karbala on 3 Apri, 2003 while I was in 3ID on the initial invasion. I think it was the same one that Trumpeter based their kit on. It was painted overall forest green, not sand. It had the same type markings as the Trumpeter one as well. I had never seen one before, wasn't sure what it was at first. I have built the Trumpeter model, it is pretty nice. Here is a page that has the tweeks needed to make it accurate.
M1 Panther II review Trumpeter used a M1A1 hull when the actual vehicles are on an M1IP hull. The fixes are pretty easy. To add anti-slip coat to the rear deck, I used fine grit wet/dry automotive sand paper. Cut it to fit and glued down with super glue.
You also get almost a whole sprue of M1A1 parts left over as well.
Here is mine:



Sorry about the photo quality, poor camera.
I plan on mounting it on a base with a map of the Karbala, Iraq area where I saw the actual vehicle.
Hope yours comes out well.