From Dallas: 28mm Space Explorers in EVA Suits from ???? - 20 points

I'm trying in this Challenge to work my way through some already-primed figures that have been hanging around awhile. These models have probably been in a Plano case for five (?) years. I think I bought them to use with the old Kenner Alien boardgame if I ever chanced to pick up a copy. 

But for the life of me, I can't remember where these models came from. They're clearly old sculpts, probably from the '80s, but were new castings available commercially. The anatomy and detail are somewhat ropey but they have a certain period charm.

The massive helmets are super-cool right?

I just did some hand-numbering on the front plates to distinguish one from the other.

Here's one with a handgun of some kind... I likely should have replaced this with something from the bits box as it's not that well done.

Number 4 also carries a gun, also not looking that good.

I figured I'd fill the blank space on the shoulders with a decal from the trusty GW sheet.

Now for some perspective... this was my vision for these four.

Or maybe something like this! In any case, it's never gonna end well for these guys.

And if anybody knows where these dudes came from please hit me up in the comments! Thanks all and stay healthy!

EDIT: The spacesuited explorers are from East Riding Miniatures! Thank you to "Captain Gamma" from TMP for the info!