Curtis Publishing got into the paperback market for a few years. Many were reprints with covers ripped off from the German SF magazine PERRY RHODAN. Others were an interesting use of the GI JOE toy astronaut in a shoestring budget setting. These appear to have been done in 1970 and 1971.
This one isn't a GI JOE, it's a model of America's first pacewalker, Ed White. With some marbles.