Supplement Four
SOC-14 5K
I really never bought into the Mercenary rules in Book 4 at all. I have a very hard time visualizing the Imperium allowing private military units with very High Tech levels of equipment to exist. I can see too many Imperial Nobles looking at the local mercenary unit and realizing that they could put every one of his household troops in body bags without breaking a sweat or loosing a man.
Interesting, that's how Hammer's Slammers was created. Friesland needed extra firepower when they cracked down to control the bluebright trade, so the created the Auxiliary Regiment. Hammer left the elite Friesland Guards to command the unit. But, when they were done, Secretary Tromp, the elected leader of the Republic, decided that he couldn't have the Mercs back on the capital of Friesland. And, he couldn't have them roaming the stars, either taking contracts.
So, he attempted to murder them all--all 4,000 of them, at the end of the engagement.
Of course, Colonel Hammer had other plans.
Hammer's Slammers, the merc outfit, was born from Friesland's Auxiliary Regiment.
And, once there was one merc outfit, others grew up in its wake.
BTW, Book 4 covers low and high tech. There is a big section on TL in the back of the book, running from TL 5 through TL 15.
Also, remember that the Imperium is a vast, big, grande thing. It takes years and decades to cross it, depending on your jump drive. Because of the way communication is in Traveller, it is likely that mercs could be outlawed in one subsector, but there may be other subsectors where mercs are commonplace.
Plus, look at what happens in The Traveller Adventure. Aramanx is balkanized. MegaCorps have their hands behind the scenes to influence what is going on that world.
Merc Companies seem to fall right into place, given that.
Tukera's Vemene organization is basically a secret merc company loyal to Tukera.