Drookian Fen Guard
Winners of the coveted Imperial Guard Silliest Name contest for 400 years straight.
The Drookian Fen Guard hail from the planet Drook VI. It's pretty much SCOTLAND IN SPESS. The Drookians are big on CLAN HONOR and all that jazz; as such regiments raised from the planet all consist of members of a single clan. They are no big fans of outsiders telling them what (not) to do, not unlike the Catachans. Unlike the Catachans however the Commissars assigned to the regiments manage to motivate the troops by telling them that the enemy has wronged fellow clan members or insulted their ancestors' honor (which may or may not be true), which gets them to haul ass fast so they can kick the enemy's.
The Drookian Fenguard regiments of the Imperial Guard are predominantly light infantry, although there are a number of light cavalry squadrons present amongst them, known for their scouting and infiltration abilities (not to mention their higher-than-average desertion rate). They're often deployed to worlds with harsh environments or noxious warzones, where their natural abilities and skills can best be put to use. The most violent and skilled soldiers within a Drookian regiment are hand-selected to be used for scouting, guerrilla warfare, infiltration and sabotage.
Victoria Lamb makes good Fen Guard models complete with KILTS. YES. You can find her website here.