As a kid, I figured out that combining these sets with other dimestore novelties could result in some B-Movie goodness, so I had Cowboys vs Giant bugs and Army Men vs Dinosaurs quite often. This is the only skill of merit that I taught my children.
AKA Brian Heiler author of "Rack Toys: Cheap, Crazed Playthings" and co-editor of "Toy-Ventures Magazine". Co-Host of the "Pod Stallions" podcast. Host of the Brick Mantooth Youtube channel, painter, designer, writer, mental health advocate, toy collector, Mego, and Mego Knock-Off enthusiast. I have large feet, ADHD and I live in Canada. Talk toys, not others. 
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Awesome stuff. I know I had a bunch of those astronauts lying around – never knew where they came from. Not sure if I had any of the others, but of course I had a pile of generic green U.S. soldiers (Vietnam era I suppose since they carried M16s).
Overall though I was into more upscale plastic soldiers, primarily Britains and Airfix from various historical eras – Greeks/Romans, Middle Ages, American Revolution, Napoleonic Wars, Civil War, WW2, modern age, etc.
Fun stuff! Some of my best memories are playing army men with my Grandpa, and then playing the same way with my son. How many of us had Shogun Godzilla attack their army men?