The Blue Rambo Shirt is a clothing item found in Apocalypse Rising. It can be bought on the new-spawn screen for one credit.
The Blue Rambo Shirt is a variant of the Rambo Clothing. It is considered to be a step up from Civilian Clothing, and shows that the person who wears it is at least a little bit experienced. It does not help you blend it at all, as not much in the map is blue. It is usually ignored, or picked up because it is a nice color, since it basically gives you away. The main difference between it and the civilian clothing is the fact that it is short sleeve and has gloves.