Colonial Troopers, softback roleplaying game, by Steve Perrin & Thomas Denmark
“What if the first RPG was inspired by hard Science Fiction as written by Robert Heinlein, Poul Anderson, Isaac Asimov, and Frank Herbert instead of Tolkienesque fantasy?
Colonial Troopers is a science fiction RPG compatible with the original fantasy roleplaying game and subsequent editions, and other “OSR” games that follow in the mold of the original like, Guardians, Warriors of the Red Planet, and others. If your tastes run towards battle hardened combat armour, some attention to real physics, and explorations of just what it is to be human, you’ve found the right book. As in the fiction of the above writers, the players are confronted with an unforgiving universe full of wonders and deadly quirks of science ready to astound and enchant, and cull the unwary.”