http://m.imgur.com/a/G8a3Y one picture from when my grandparents was in and this is all that I have to get an idea of the uniform

This guy's flickr page has a whole bunch of photos from the Korean War, as well as time in Japan and Hong Kong. This particular album has photos of Korea (including soldiers in uniform) from 1950-51. There are loads of other albums, some black and white, but mostly color.

So my main question is what color were the uniforms with the rank on there arm. I looked through those pics and I'm not seeing any rank on there arms