The "Earth Defense Force" (EDF) is a fictional military organization featured in a series of video games developed by D3 Publisher. The EDF is tasked with protecting Earth from various alien invasions and giant monsters, often using a wide array of weapons and vehicles. Players typically take on the role of soldiers fighting against these threats in cooperative or solo gameplay. The EDF series is known for its over-the-top action, destructible environments, and a variety of missions that challenge players to strategize against formidable foes. The games often feature a campy tone, blending serious themes of defense with humorous elements, making it a unique experience in the action game genre.