++ Chamber Borealis ++

Not only are the Astartes possesed of fearsome strength and resilience as a result of their genhanced physiology they are not exhausted by physical exertion in the same manner as we are either. While there are ultimately limits to what even the most well trained and conditioned transhuman can endure, they are to all intents and purposes almost completely indefatigable. 

Indeed, if the calculations based upon my observations of the Argyntum Stellæ training regimen are accurate, then at a conservative estimate the average Astartes can sustain a pace militari at a consistent speed of 13 miles per hour for around 20 hours before requiring rest. As such said Astartes could cover a distance of approximately 261 miles and still be fit for combat with little to no recovery time.

Given such a level of physical endurance, the inclusion of personnel carriers in the order of battle of an Astartes force might seem a little superfluous and indeed I asked [REDACTED] about this not long after I had been granted permission to interview those of my hosts who were amenable to it.

A rather naïve enquiry in retrospect, though of course I did not appreciate this at the time. The answer though was simply that a battlefield is a dangerous place and few are the warriors who do not value the additional level of protection that an armoured transport affords them beyond that of their own warplate. 

Like most Astartes forces, the Argyntum Stellæ were possessed of a number of patterns of armoured personnel carriers but the most numerous and easily recognisable was the Rhino. While perhaps not as fast as a Hesperus Grav-Tank or as heavily armed and armoured as a Land's Raider, the Rhino was favoured by many within the Legion for being mechanically reliable and of robust enough design that it could safely deliver an entire unit into battle within its armoured hull and even being capable of functioning as a mobile base of operations on extended deployments.

As it would turn out, this last factor would prove of vital importance in many of the undertakings that the Argyntum Stellæ would come to embark upon.

Illiatariu. C., Rememberancier Documantist Minoris. To Walk Among Demigods. A Treatise Upon The Nature of The Argyntum Stellae., Published 863.M33, Sector Heliopolis, Segmentum Pacificus.