Hi Chris,
Thanks for the input! What you're saying makes sense. However, although MOZ is showing versions of each country code as duplicate content, I am wondering if google is seeing the same thing.
I have attached a screenshot from google webmaster tools of my sitemap index. As you can see, google is using the main /all-sitemaps.xml which contains individual sitemaps for each country subdirectory. You'll notice that google is only indexing the .com/us version. Does this mean that google is not seeing the duplicate pages from the other country subdirectories?
Also, would you mind listing the other bits and pieces that you think could be improved on the site to bolster SEO?
I really appreciate your help!