Is it a RUSH? Is it an RMK? What exactly is it? Quite simply the perfect 50/50 Sled. Trail gearing with added flotation. The Assault® for the Flats. This is the weapon of choice for all-around terrain domination. A blend of RMK heritage and trail-proven RUSH technology. The Switchback Assault can run the logging roads or head for the trees. Looking for an Assault for the mountains and deep snow? See the "original" RMK Assault.