With Jump Packs. Yes Jump Packs. More info after the break.

So Forge World actually released a bit of stuff at the same time it seems.  More info on the Destroyer Squad though..

The jump pack, common amongst Space Marine Assault squads, is sometimes utilised by Destroyer squads. The increased mobility they provide enables the Destroyers to deploy more rapidly into battlefield positions, unleashing their destructive arsenal upon the foe.

Designed by Will Hayes, the Legion Mk IV Destroyer Squad with Jump Packs set contains five multi-part resin models with four pairs of Tigrus pattern bolt pistols, as well as three phosphex bombs and a rad-missile launcher. These models are available to pre-order now and will be despatched from Friday 26th July.