THE SEARCH FOR THE
Let's just suppose that 70% of the shuttle crafts cargo in the years 1984 - 1993 were US military. And for the story's sake, let's suppose that it was well known in some circles that humanoids had lived on Mars up to 10,000 years ago and may still exist in small pockets underground around the polar ice caps.
In 1979, the Mars photos taken by the surveyor were being carefully studied to identify at least 7 sites containing structures built from surface material of the planet.--from ANON
Think of Los Angeles 100,000 years from now after the oceans are gone and the sand blows like a Banshee. We're waiting for the actual Surveyor closeup mapping to begin: these are the old Viking photos, reconnaissance only. See Surveyor Cydonia for more recent hi-res images.