Personally, I would include all of the possible character careers mentioned in
Supplement 4: Citizens of the Imperium.
For those that do not have the book, the following careers are given.
The twelve character types contained in this booklet are:
Pirates: lndividuals crewing interplanetary or interstellar vessels, who make their living by attacking, hijacking, or plundering commerce.
Betters: lndividuals who prospect and mine asteroid belts in search of mineral deposits, artifacts, or salvage materials.
Sailors: Members of the Nautical Force Command (the wet navy) of a world.
Diplomats: Members of the Foreign Service of a government.
Doctors: Trained individuals conducting medical practice.
Flyers: Members of the Close Orbit and Airspace Control Command (the air force) of a world.
Barbarians: Rugged individuals from primitive planets accustomed to hardship and well-trained in wilderness and survival situations.
Bureaucrats: lndividuals serving a government or organization in management or executive capacities.
Rogues: Criminal elements familiar with the rougher or more illegal methods of accomplishing tasks.
Nobles: lndividuals of the upper classes who perform little consistent function, but often have large amounts of ready money.
Scientists: lndividuals trained in technological or research sciences who conduct scientific investigations into materials, situations, and phenomena.
Hunters: lndividuals who track and hunt animals of varying sizes and types for profit or enjoyment.
A few of these are picked up in T5: the Noble, Rogue, Scholar=Scientist, Functionary=Bureaucrat.
However, the rest all fill in missing places in the career spectrum, especially the Doctor/Medic, the Pirate, the Belter, the Barbarian, and the Hunter (the Safari ship as a standard ship type).
Adventure 10: Safari Ship requires the Hunter as a player character or NPC.
The Sailer and Flyer skill sets lead naturally into the nautical and aerial forces for a world. While MegaTraveller did use the Flyer skill in
Close Orbit and Airspace Control Command, aside from the Wet Navy articles in Challenge, which I consider poorly done, nothing really was done with the Sailor character. In both
Adventure 2: Research Station Gamma and
Adventure 8: Nomads of the World Ocean, someone with Sailor Skills could be of enormous usefulness to a party.
The Traveller Book does make provision for Vehicle cascade skills which include Flyer and Water Craft, which further cascade, but these are more incidental skills than a specific character class. However, you could adapt the skills in
The Traveller Book to reach a needed character.