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.