How to get South American Disguise

Okay, so it’s my second time through and I want get the second disguise for south america. Problem is, all the cheat sites don’t specifically state how to get it in the first area of South America. First I tried killing everyone. Then tried waiting until the militia was all executed. Third (and an hour and a half later), I decided to free them all. Turns out, that’s how it’s done. They unlock a shed to the right of the start point. Inside there’s a disguise and a double barrel shotgun (and other stuff). So yeah, that’s how you get it.

Oh yeah, in both the levels with militia, help ‘em out.