Galactic Marines

The “Galactic Marines” series by Ian Douglas (pen name that the author William H. Keith, Jr. uses when writing this series) is actually made up of three trilogies (“Heritage” trilogy, “Legacy” trilogy, and “Inheritance” trilogy) to make one big series. All three are about the United States Marine Corps. The “Heritage” trilogy is set far into the future, and the later trilogies (“Legacy” and “Inheritance”) are about the descendants of the first one. The series is from the genre of military science fiction, and started with the release of the novel “Semper Mars”, which came out in the year 1998.