A Lions Rampant Reiver Squad.
The Chapter eschews stealth in preference of frontal assaults where the foe can be dispatched eye-to-eye. More than that, they view the kind of terrorism and sabotage operations that the Reivers are meant to do as dishonorable. Instead, the Lions Rampant have issued Mk X plate to Assault Squads, who function identically to other Chapter's Reivers on the tabletop. Namely, they deploy by grav-chute from a thunderhawk and lay into the enemy in close combat, but maintain the look and feel of the classic Assault Squad rather than the Reiver special operatives.