U.S. Army Robobrains are hostiles The Courier may face in Obsidian Entertainment's Fallout: New Vegas. They can found wandering around the Mojave Wasteland attacking whom and what ever they come across. The U.S. Army Robobrains of Fallout: New Vegas are voiced by Wil Weaton. The courier may collect fission batteries and energy cells from defeated U.S. Army Robobrains.