I like these LP style astronauts I saw online. They are hollow plastic and 5 inches tall. If you recall they are the rifleman of the range - 4th from the left.
The little silver martian appears to be holding up a landing marker or similar with his other arm behind his back! I've seen him a million times over the years and have no idea who he is. Anyone?
Hi Woodsy, here is a pack of the 3 space aliens you showed. All the best, Andy B.