Reception of the book has almost always been positive from many respectable sources, but it is violent. It has also become suggested reading for many military organizations, including the United States Marine Corps. Ender’s Game was recognized as “best novel” by the 1985 Nebula Award and the 1986 Hugo Award in the genres of science fiction and fantasy. Its four sequels—Speaker for the Dead (1986), Xenocide (1991), Children of the Mind (1996), and Ender in Exile (2008)—follow Ender’s subsequent travels to many different worlds in the galaxy. In addition, the later novella A War of Gifts (2007) and novel Ender’s Shadow (1999), plus other novels in the Shadow saga, take place during the same time period as the original.