In the altered timeline, during The Uprising, a different Desolator design was more machine than man. They were also the only infantry unit apart from Cosmonauts capable of surviving on the Moon during To the Moon. In the Soviet campaign of Yuri's Revenge, they became available during Operation: Romanov on the Run. The following is based on the Soviet campaign of Yuri's Revenge and might contradict canon. In the Soviet campaign of Red Alert 2, they became available during Operation: Desecration. The following is based on the Soviet campaign of Red Alert 2 and might contradict canon.
A few of them were also deployed during Operation: Fallout. Louis during Operation: Free Gateway, where they demonstrated their abilities on captive civilians. In the Allied campaigns, they were only encountered in the occupied St. They were quite fast and spoke in a raspy, tired voice. Each soldier was equipped with a nuclear battle suit that protects him from Radiation.
Created by Iraqi scientists, the Desolator utilizes a Radiation Cannon to irradiate the ground around him, making it completely impassable to both infantry and light vehicles.