S.D.I. (Strategic Defense Initiative) is the name of two unrelated video games. The first is a 1986 action adventure computer game developed and published by Cinemaware. The other is a 1987 arcade game by Sega. Though these games are largely unrelated—for the most part their only similarity is in name—they are both set during the Cold War.
In the game, the player takes the role of the commander-in-chief of the American SDI system, who according to the game manual is a General named Sloan McCormick, presumably in the United States Air Force. McCormick has his headquarters in the American space station, which monitors a network of twelve anti-missile satellites in geosynchronous orbit over the United States. The game's advertising blurb, available at Mobygames, indicates that these American satellites employ particle beams. The plot states that Russian revolutionary extremists, led by discontented members of the KGB have gained control of several ICBMs, as well as space launch facilities needed for deploying manned orbital fighters. Because they have received no response to their demands for the Kremlin to surrender and for the Americans to abandon their SDI system, the revolutionaries have begun using their seized assets to periodically launch fighters against both space stations. They have also begun periodically firing waves of nuclear missiles at the United States. The player engages the enemy projectiles and enemy ships using a space-based fighter. The player must destroy the incoming missiles lest they wreak destruction upon the U.S. The player must also make repairs to the defense satellites that become damaged during the battles.
Later in the game, the player continues the role of McCormick as, in order to finish the game, McCormick must make a desperate attempt to rescue his lover -- he does not necessarily have to succeed. She is the Soviet station commander, and according to the manual her name is Natalia "Talia" Kazarian. She is placed in grave danger because her station is eventually boarded by the enemy forces, so McCormack must attempt to fight his way past them and reach Kazarian before she is killed. The manual even goes so far as to say that she is at risk of torture, but this is not shown. It is interesting that "Kazarian" is definitely not an ethnic Russian name. In fact, it can be confirmed if one goes to the web site that the name is from Armenia, or, in the counterfactual universe of the game where the Soviet Union did not fall in 1991, it is from the Armenian Soviet Socialist Republic. The concept of a high-ranking female officer in command of an orbiting Soviet military installation is also interesting when one considers certain realities of gender discrimination -- even in light of such exceptional luminaries as Major General Valentina Tereshkova. Complex issues of Soviet racism and Soviet cultural assimilation would certainly have impacted the life of such a person as the fictional Natalia Kazarian. A person in such an important position of authority who was not an ethnic Russian might well have been a carefully vetted 'pet native' prize pupil, selected for special treatment on the basis of political reliability and above-average potential, with perhaps a special dispensation to attend Moscow State University.
It was ported to the Sega Master System, released in some countries as Global Defense.