Global Defense/SDI [Master System Longplay] - SEGA Kidd

Developer: Sega
Year Released: 1987

SDI - Strategic Defense Initiative, or simply titled SDI and sometimes known as Global Defense, is a 1987 side-scrolling shoot 'em up arcade game originally produced and released internationally by Sega. It was later ported to home computers and game consoles, some by other companies. Players control a satellite and must destroy enemies by moving a crosshair over them and firing the satellite's weapons

Each stage is split into two sections; offensive mode and defensive mode. During offensive mode the player engages a number of enemies, with the aim of destroying them all without the satellite being destroyed by the enemy. Should the player destroy all enemies during offensive mode, they are awarded 20,000 bonus points and begin the next stage on the offensive. If any enemies evade destruction during offensive mode, the player must complete defensive mode, where they are tasked with protecting the homeland from incoming warheads. Completion of defensive mode advances the player to the next stage, where they go on the offensive again.

This so-called "Star Wars" program was introduced by U.S. President Reagan to promote defensive weaponry that could shoot ICBM's out of space. - Wikipedia