XCom before XCom. Star Command had space flight, exploration, ground combat... enough different weapons to fill a set of Matrix sliding shelves... including chemical weapons!
You started small, but could upgrade your ships, train and promote your soldiers... commit piracy by threatening other ships - stealing their goods or just fuel if you were hard up for it.
The game was just so amazingly deep, a brilliant example of turning the dreams of space flight and future warfare into a digital computer game!
Truly a brilliant game from SSI! One of the absolute high-point games from my time at University!