Before the Cataclysm, Man tinkered with his genome, and came up with several castes, each specialized for his or her work environment. The castes with the largest remaining numbers are the Citizen (who are typified by the PSH entry in GW5), the Military, the Police, the Scientist, the Industrial Worker, and the Park Ranger. The later 5 are so specialized, that they must take a certain profession, but gain skills at list price-2 (to a minimum of 1). Each has its own "mutations" and "defects" due to the gengineering, but all have been through the GST (genetic stabilizing treatment) and so can not mutate when exposed to radiation. If these castes are used, the GM must replace the Invader history of Gamma Terra. The game material for the later 5 races are as follows:

Military Profession – Combat Spec
Mutations: Enhanced STR, Improved CON, Improved DEX, Redundant Vital Organs
Defects: Light Sensitivity, Sound Sensitivity, Reduced PER (slight), Weak Immunity 

Free Broad Skills: Athletics, Stamina, Knowledge, Awareness, Melee Weapons, Ranged Weapons

People of the Military caste can use all artifacts designated (h) and (a). Because of the sensitivities to light and sound, all body tanks/powered armor have built in systems to compensate. Also there are sealed against biological weapons, keeping the soldier safe from disease.

Police Profession - Combat Spec 
Mutations: Improved CON, Improved DEX, Enhanced Senses, Dermal Reinforcement 
Defects: Reduced STR (slight), Toxin Intolerance, Susceptible to High Impact Weapons 

Free Broad Skills: Athletics, Stamina, Knowledge, Awareness, Interaction, Ranged Weapons

People of the Police caste can use all artifacts designated (a). As slug throwers were being replaced by lasers, the increased damage from slug throwers was considered acceptable. The toxin intolerance was an unfortunate oversight in the genetic labs.

Scientist Profession - Tech Op 
Mutations: Improved INT, Improved WIL, Increase Senses, Quick Thinking 
Defects: Reduced STR (slight), Reduced CON (slight), Slow Reflexes 
All have Observant Perk. 

Free Broad Skills: Knowledge, Awareness, Interaction, Computer Science or Life Science or Medical Science or Physical Science, Investigate

People of the Scientist caste have a -1 step bonus to all attempts to examine/use artifacts from the Ancient and Shadow Ages. Quick thinking was the first attempt at altering the brain. It worked at increasing intelligence, but slowed reaction time; the brain- muscle interface was being overwhelmed with information. Those who are doctors usually are among the highest regarded White Hands (Healers).

Industrial Worker Profession - Tech Op 
Mutations: Skeletal Enhancement, Improved CON, Improved DEX, plus 2 points that are job related (e.g. Gills, Environmental Adaptation, etc.) 
Defects: 6 points that don't relate to the job 

Free Broad Skills: Athletics or Acrobatics, Stamina, Knowledge, Awareness, Interaction, and 1 that is job related

People of the Industrial Worker Caste have a -1 step bonus to all attempts to examine/use artifacts from the Ancient and Shadow Ages. There are many subraces of industrial workers, each engineered for their specific job. The GM together must decide the unnamed mutations, defects and skills.

Park Ranger Profession - Scout 
Mutations: Chameleon Flesh, Dermal Reinforcement, Improved DEX, Improved CON, Night Vision and 2 points relating to biome 
Defects: Sever Phobia (urban areas), Reduced PER (slight) and 2 points not relating to biome 
All have Danger Sense Perk 

Free Broad Skills: Athletics or Acrobatics, Stamina, Knowledge, Awareness, Survival, Ranged Weapons

People in the Park Ranger caste have a -1 step bonus to all skills used in their native biome. With the war between industry and environmental groups growing to cold war condition, some geneticists who were sympathetic with the environmentalists, developed a caste that protected the few natural areas left. They usually worked with the police and governments in stopping illegal environmental damage, but some were terrorists. Oddly, because of the non-importance of the green areas during the Final War, Park Rangers had a slightly better chance of surviving the Cataclysm. Today they are close allies with the Gren and others who live with nature. Terrorist Park Rangers can use (a) type artifacts. 

There are many more races- those adapted to space, to the arctic, to the deserts, and to other planets. A few are still found on Gamma Terra.