In that case Matt, I think it might be FS11126. But be careful, there are two numbers that correspond to what the USAF called 'Arctic Red', one of them being the one above. The other, which I think is FS11135 is much darker, appearing more of a ruby red.
The colour shown on Eric's pics of the Navy T28's is the colour I think of when talking of 'Arctic Red'. I found a web - site that had the listings, and colour swatches. I'll get the address for you, so that you can see which is which. If I can find the darned documents I need, they have all of the details, and they should be right, as they were sent to me by the USAF Museum, Dayton, specifically for details of the Arctic Red on the WB50 Weather Recon ships. I seem to recall it gave the FS, Methuen and Pantone references. I'll keep searching amongst my piles of cr...sorry, my reference library!