StarGuard!

Starguard! (1974) by McEwan Miniatures. 2nd Edition 1975.

"In those glorious golden days of the 23rd Century, when the Terrian Federation was still in its infancy, long before the Peace of the Empire, when no ship traveled the Starlanes unarmed, all that stood between the fragile glassine towers of Terra the Beautiful and the ravaging hordes of Ralni, Dreenoi and other lurkers in the darkness were the men of the Starfleet Command. It is to the marines of the Federation Navy, the STARGUARD, that this record is respectfully dedicated."

Man to man (or alien) SF miniatures tabletop warfare. This is a skirmish-level game, with a relatively small (perhaps up to a dozen) figures per player. The figure / building / vehicle scale is roughly 1" = 2 yards; the ground scale is 1" = 20 yards. "HO" scale model train buildings, trees, etc can be used as tabletop terrain, although the publisher makes a lot of cut-and-fold papercraft buildings.

Starguard, and its associated miniatures line, has been around since 1974. The first edition (available in a facsimile edition by RRB Minis and More) introduced the Starguard (human marines), Amerons (rebellious human colonists), Dreenoi (telepathic insectoid aliens), and the reptilian Ralnai.

The 2nd edition (1975) added the Eli ("Space Vikings"), Thogs (bestial reptilians, implanted with brain control devices and used as shock troops by the Ralnai) and Rep-Com (humans from the Republic of Commerce).

The Orilla supplement introduced the Orilla (sturdy gorilla-like humanoids), Terrellians (non-humanoid creatures from a planet conquored by the Dreenoi), Necromorphs (animated human corpses, used as cannon fodder), and Nektons (amphibians humanoids).