LIFE FORCE, a fictional group of travelling doctors in Africa, in the Hong Kong TV series The Last Breakthrough.
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However, the Japanese re-release of LifeForce, released later in 1987, is further differentiated from Salamander with additional minor graphical tweaks, and a revert back to the original Gradius power-up system, instead of the simplified version in Salamander and the North American LifeForce release.
In North America, LifeForce is most popularly known for its pseudo-port to the Nintendo Entertainment System in 1987, and not for its arcade release.
LifeForce also made use of the famous Konami Code, which in this version increased the number of lives from three to 30.
The action of Opposing Force cleverly interweaves with the original events of Half-Life, so that the player catches a glimpse of Gordon Freeman, the player character from the original game, sees an officer making a pivotal radio broadcast that Freeman overhears in the first game, and visits some recognizable locations.
The Black op forces (seen only briefly in the first game) are acting independently of the marines, and intend to destroy the entire complex with a thermonuclear warhead.
Shephard leaves the infirmary and makes his way towards the extraction point, where he learns that the military forces in are pulling out of the facility.