Chikyuu Boueigun Nirasawa Chuutonchi

After graduating from training school a rookie soldier is assigned to planet earth defense force, a force dedicated to protect the planet from aliens. When he arrives, he discovers that due to years of peace and budget cuts, the number of members of his squad have been reduced to just 3 soldiers, and those 3 have pretty unique personalities. Will he get along with them? What jobs will they do? And will their days of peace continues?