The Military Base has 5 maps and is for version 1.3. The file is 235KB in size and the file name is military.zip. I really could not tell when it was released. The maps are dated 1980 which does not make sense. Also the text doc states there should be a user.con included but there wasn't. And the maps are numbered e1l1, e1l2, e1l5, e1l7 and d.map. To play the first 3 maps as a mini-episode just rename e1l5.map to e1l3.map and play the other 2 maps as user maps.

Headquarters (e1l1) has poor level design and fair gameplay with very little detail and not much ammo. It's the best of the bunch and that's not saying much. It's straight downhill from there.
The Mephestest Base (e1l2) poor level design and gameplay. Reactor Core (e1l5) is another poorly designed level.
The other 2 levels Tower Of Babel (e1l7) and D.map are also not very good.
If you want to see for yourself download it. But don't say I didn't warn you.

Download Here