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Way back in 1984 when I was a young 21 years old, I purchased one of my favorite SSI computer games: 50 Mission Crush. Back then, I had a heavily modded Atari 400 computer with extra memory (48K) and a custom keyboard. So of course I got the Atari version of the game.
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By today's standard, the game is crude with basic graphics and lots of text with numbers. But what it lacked in graphics, it made up for it in tension and addiction for an early computer war game.
Moby Games has a nice section devoted to 50 Mission Crush. A quick Google search will also turn up abandonware sites where you can download the game (only 102k in size!), as long as you don't have Windows 7 64-bit installed.