GAME OVER, MAN
The bugs are through the perimeter, the gates of hell have opened, the mothership is landing, and the Captain's brain got sucked out... there's only one thing you can do, Marine... Stay Frosty.
Stay Frosty is an OSR game of future marines versus whatever the universe can throw at them. Use these rules to play games in the style of your favorite military sci-fi movies and video games. PC's will have to balance escalating tension and dwindling resources against staying Frosty to complete their missions.
Stay Frosty uses a "roll over" system instead of The Black Hack (1st & 2nd Ed.)'s default of "roll under."