Originally Posted by storyteller
I think the color is simply because the IP armor from the top is red. It could be easily mistaken for Iron Man in action. The comics got away with it by having Iron Man be mia for the duration. But movie wise I can easily see the audience mistaking him for Iron Man if the two were on screen together or in trailers. It's one of those reasons why War Machine is black and white.
I can easily see that being that case as to why the IP is now mainly blue instead of red.