PHOENIX COMMAND!
Phoenix Command is
directly responsible for me buying Twilight: 2000.
And that's the only good thing I can say about it (aside from the artwork being quite good). Far too complicated for my tastes.
When I finally got into RPGs, being in the Army Reserve at the time, I wanted a military themed RPG and found Phoenix Command. It convinced me that there was an easier way to do things so I went searching for a better rules system and found T2k 2nd Ed.