A few things to add:
The Ambush game by Victory Games had a 2 player version called Shell Shock.
In the Sniper line, there are these games/add ons:
Sniper (SPI & SPI/TSR)
Patrol (SPI)
Hetzer Sniper (SPI/TSR)
Special Forces (SPI/TSR) [Modern day]
Bughunter (SPI/TSR) [Outer space]
The SPI version used hex numbers for activating individual soldiers randomly.
The SPI/TSR version revamped the system and made it much better by assigning soldiers an activation rating; "better" soldiers would be activated more often than "lesser" soldiers.
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The hammer shatters glass, but forges steel. (Russian proverb)