BattleZone 1998

The game has two campaigns, the American NSDF campaign (National Space Defense Force) and the Russian CCA campaign (Cosmic Colonist Army).[4] The game takes place in an alternate version of the 1960s in which the United States and the Soviet Union use alien technology to wage a secret war across the solar system, fighting for control of the rare resource bio-metal.
The game starts in 1952 when a group of meteorites falls near the Bering Strait, which both the Americans and the Russians are able to recover. In these meteorites they find "bio-metal", and discover that with it they can build vehicles with amazing features, such as the ability to hover. Both the Soviets and Americans send forces to the Moon; the Apollo program is revealed to be a cover-up for the massive American military operation there.[5] The American space military force is called the NSDF, for National Space Defense Force, and the Soviets' is named the CCA, for Cosmos Colonist Army (However, manuals for the earlier version of the game call the CCA the 'Communist Cosmonaut Army'). The Soviets force the Americans off the Moon by destroying the main American outpost there, called Eagle's Nest 1. The NSDF relocates to Mars, only to discover that the CCA is already there. An alien artifact is discovered there by both sides, presumably by the same race who created the bio-metal. A weapons factory built by this civilization is also found on Mars. It is revealed that the race in question called themselves the Cthonians, and lived on a planet called Icarus that occupied the orbit of what is now the asteroid belt. According to the game, Greek myths were based on visitations of Earth by the Cthonians.
The Americans learn that the Cthonians were divided into two warring parties who battled throughout the solar system. Each side apparently pursued an ultimate weapon that would destroy the other. To follow the trail of this weapon, called a Fury, the Americans travel to Venus. Another artifact from a Cthonian city is recovered, pointing the way to a weapons research facility built by the Cthonians on Io. When the Americans arrive at Io, they find a relic from the facility and begin to bring it back to their base. However, one of the tugs carrying the artifacts is piloted by a Soviet defector, named Dr. Wilhelm Arkin, who steals the Fury relic and brings it to the Soviets. Enraged, the Americans conduct a secret operation on Europa to steal a Soviet Flanker and tap into the Soviet communications network to discover the whereabouts of the Fury relic. It is found that the relic has been moved to the main CCA base on Saturn's moon Titan.

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P/S: "Sorry, there is not enough memory to continue.

Please make sure that you have at least 50MB free on your hard drive and that virtual memory is not disabled."

When you see that message it means you have more than 3GB of RAM, which is confusing BZ. It also means you have 64bit Windows. If you are on Vista or 7, solution for this is simple - run BZ in a compatibility mode for WinXP.

If you are on XP you have to install Microsoft Application Compatibility Toolkit and make own patch. More about that on the forum.