This article describes a feature in the first Apocalypse Rising
The Blue Rambo Pants are a clothing item that can be found in Apocalypse Rising. It could be bought at the spawn screen for one credit, but is now bought with a gamepass.
The Blue Rambo Pants are a variant of the Rambo Clothing. They are considered a step up from Civilian Clothing, and shows that the person who has it is at least a little bit experienced. It doesn't really help you blend in, but it doesn't really hurt you either, unlike the Red Shirt and White Pants. These pants look like typical jeans. The main difference between these and civilian pants is that these appear to have boots instead of shoes.