I've e-mailed CMG two months ago. Here is a portion of the reply from a CMG representative.
"The US Government model is hard anodized... Other than that, they are exactly the same light."
The only other differences are the case color, engraving, and packaging. The Ultra-G does not come with any accessories.
"The US Government model is hard anodized... Other than that, they are exactly the same light."
The only other differences are the case color, engraving, and packaging. The Ultra-G does not come with any accessories.