Après quelques recherches, voici ce que j'ai trouvé (et qui me va bien =) )
The Skitarii are the armed forces of the Adeptus Mechanicus, the faction that produces and maintains virtually all vehicles and engines of war in the Imperium. As such, in addition to peculiar Mechanicus vehicles such as giant land crawlers, the Tech-Guard has access to every type of vehicle used in the Imperial Guard, Imperial Navy aircraft such as the Valkyrie, the Marauder, the Thunderbolt or the Vulture, and are known to have utilised the Rhino armoured personnel carrier. It is unknown if the Skitarii make use of other vehicles employed by the Chapters of the Adeptus Astartes, though one can presume that it is possible, if their Forge World is industrious enough to outfit its forces with them and fulfill its production quota. The Tech-Guard has no access to the Land Raider, as by the Emperor's decree issued during the Horus Heresy, those vehicles are the sole possessions of the Space Marines. The Skitarii also do not utilise Dreadnoughts, for the obvious reason that they must be piloted by a mortally-wounded Astartes.