One of the most “top secret” Tan’s secret bases
Sgt. Hawk & news reporter Vikki Grimm visited Area 41, the Tan secret base, one night of 2001 during Army Men Advance campaign mission. There he had to fight his way to reach Hangar 13, defeating Tan soldiers and Grey Aliens as well. It is not known for sure what were the motivations of these Aliens, if they were working with the Tan or simply were an independent faction. The only clue thrown by Hawk report was that at the base where they were also there was a starry flying saucer. So maybe in the confusion Hawk and Vikki were confronted by the Aliens when they were considered enemies.
For those times Plastro was planning to use Alien technology to assault to the Green Nation. Hawk entered to the heart of the Alien World, the Area 41 to frustrate Plastro’s plans.
But later, despite having achieved victory over the Tan Army, Plastro got a flying saucer using reverse engineering. So after the Green Army defeated his army, Plastro was the last man to fall, fighting Sgt. Hawk & Vikki.