I've seen Rambos on the Greenbelts and would like to become that guy (because ya know... it looks cool). I have also completed all the challenges and thought there would be a reward for it (RP, XP, Achievement, A RAMBO SKIN). It would be cool to be able to get the Rambo skin (or any elite skin) for your character after completing these challenges. They don't need to have any special abilities it would just show to other players that you completed all the challenges.

I'm pretty sure this is possible via some script at least in SP Campaign. Think the modders would say more about that.

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"Ad cogitandum et agendum homo natus es"

I work quickly, cheaply and qualitatively. You can choose only two of the three options.

Its fairly easy to do yourself. I can tell if you want me to,, but it isn't available to be used client side(online)

You can add few lines of script so you can look like rambo when using type III vest.
But i dont remember that script Maybe DIO has it written somewhere?

Yep, I have it in my Inbox, but it would be a bit useless since Testpilot14 can help him.
Actually you may have forgotten that the script was applied for Green faction and for the Vest III only and seems he asks for another thing. Anyway, I'm sure you haven't done it yet for the Gray faction.

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"Ad cogitandum et agendum homo natus es"

I work quickly, cheaply and qualitatively. You can choose only two of the three options.

With a little bit of file editing, you can change your character model to look like the Rambo by designating a vest and putting on said vest. That is to say, go to the "factions" file, open one of the colours (vanilla colours are "green", "grey" and "brown") in Notepad, scroll down to the "default group" section and alter one of the model filenames.

The result of changing, for example, the Type II Vest in one of the faction files to give the player the Rambo model SHOULD look something like this:

Hope I helped!