At the time of the Heresy, though, very few units of Space Marines were equipped with Jump Packs. In much the same way that Terminator Armour is still seen as a badge of honour amongst Astartes, being a member of a Jump Pack-equipped assault unit was a source of pride and prestige. Such troops, being rare, were employed only for highly specialised and often highly dangerous missions. All of these factors combined to instill a unique esprit de corps amongst the warriors of Jump Pack-equipped units, and it was this spirit of dangerous individualism which was to have terrible consequences during the Heresy.