The humans of Saiph are descendants from House Grammaticus void ships, remnants of the Brimlock Dragoons garrison, and indigenous locals who claim their heritage goes all the way back to old Albion. Saiph has remained largely untouched since the end of the Damocles Gulf Crusade. Being on the edge of T'au space but still on the distant end of the gulf left open for the Imperium to take easily early in the campaign. The Brimlock Dragoons left were well disciplined but found themselves left behind when the crusade would return to fend off the Tyranid threat.
House Grammaticus united the Garrison of remaining guardsmen with locals into a new combined Saiphan Planetary Defense Force. Most will never leave Saiph, only making it as far as the parade grounds of the capital citadel parade grounds before eventually returning to their home towns. Only the most elite will find themselves being recruited into the Rogue Trader's personal army of armsmen. The rest will end up in the Expeditionary Regiment, and will be deployed as Company Landing Teams. Small maneuver units meant for finding lost treasures on planets out of the reach of the Imperium, they don't have the heavy armor or numbers to force an occupation on a xenos planet.
Planetary Defense Force
Service Corps Woodsmen
A variant of the gun truck, built on the same frame with an extended crew compartment. This vehicle is favored by commanders and their staff to give them room to plan while in transit. The variant has a suite of communications and cogitator equipment. The vehicle also takes the role of the ambulance when a situation goes awry.
High Back Truck
Another variant of the gun truck, tool boxes have replace the original bed. The high back canvas covers the room between tool boxes giving room for a few personnel or field rations and water.
Siegfried Matilda Pattern Scout Tank
Leman Russ Matilda Pattern Main Battle Tank
Not incredibly quick, this high flying dirigible can give important insight for PDF commanders on enemy positions on the battlefield. The Company Landing Team will often use this for the survey of rare metals or archeological interests when nothing threatening can be found.
DeathGuard Green Primer along top
White Primer along bottom
Mechanicus Grey Primer along aft
Nuln OilDry Brush Games Color Gun Metal