Morocco has waged a 25 year long war against POLISARIO forces in the Western Sahara. Morocco built a large berm around a good portion of Western Sahara to contain POLISARIO forces, and exploit the economically viable parts. Almost as many Moroccan military forces were stationed in the Western Sahara as the entire Sahrawi population. Called the Moroccan Wall. Laid land mines around the wall. The Moroccan Wall is backed by Moroccan Rapid Reaction Units.