I used to work in Metairie in the office tower right by the causeway. My hotel room faced Lake Ponchartrain. About dusk a couple times a month a couple of unmarked Bell 412s (Hueys) would land on the levy and a half dozen or so latino looking guys in fatigues and some white boys in suits would unload and come into the building where I worked. They used a service elevator or the stairwells maybe I never could get down there fast enough to see them or what was on their uniforms.
By unmarked I mean just that there wasn't any N____ numbers on the tail, no they were not "black helicopters" they were green, but they might as well have been black. This was in the mid-1980s and I supposed it was Iran Contra related VIPs or even black ops, found out later there was a DEA office on the 3rd or 4th floor. So still could've been Iran Contra related crap.
Unrelated I also worked in an office building on west 7th St in Ft Worth. We learned the DEA had an unlisted office there too when a tornado blew their paper work out the windows and all over town in 2000. A few of us recovered a couple large size mail baskets full of their docs and returned them.
They didn't even say thank you