The Army and Navy have standards. NASA guards would just be renegades who are in it for the money.
-Ok, why would all of these "renegades" keep NASA's secret? No one ever spilled the beans, not even for money?
-And if the atmosphere of the Earth freezes when far away from the Sun -- meaning the temperature would have to drop below -361 degrees Farenheit, the freezing point of oxygen -- then it would be physically impossible for people to go there -- so why would it be necessary for NASA guards to guard the place?
-And even if it were impossible for humans to get to the purported ice wall, why wouldn't we send balloons, drones, probes, satellites, etc., the same way we do to space, remote parts of Siberia, etc?
-At what point, jroa, will you simply accept that instead of constantly spinning complicated conspiracy theories and concocting jumbled imaginary maps involving ice-air and evil penguins, it's simpler just to conclude that the world actually is round?
-Based on your gif, you seem to consider it very important that a medieval Pope thought that the earth was flat. But if you asked the present Pope, Francis I (from Argentina, in the southern hemisphere, as it happens), about the shape of the Earth, what do you think he would say?