GURPS uses a system of templates to represent both races and professions. Thus, a player can combine a racial template with a professional template to get the basis of a character: a Xenon Mecha Pilot or a Aron Spacer, for example. There is no template for the human race; we're considered average for GURPS purposes (makes life easier). It's also easier than the Palladium OCC/MOS system. The templates represent complete, playable characters, although there is always room for customization. The occupation templates are taken from GURPS Warriors and adapted to the Stellar Imperium tech level and specific setting, except for the Space Force Science Officer template, which is my creation.
There are six main races of the Stellar Imperium: Humans, Drugan, Legato, Xenon, Aron, and Animo. While Humans are the main race of the Stellar Imperium, the others are interesting to play, and the Xenon and Aron, and the Animo to a lesser extent, are common in the Stellar Guard. For more details, check out each race's page.
Officer and NCO templates - additional skills and Rank for officers and noncoms.