The Vietnam War resulted in veterans with combat experience deciding to write science fiction, including Joe Haldeman and David Drake. Throughout the 1970s, works such as Haldeman's "The Forever War" and Drake's "Hammer's Slammers" helped increase the popularity of the genre. Short stories also were popular, collected in books like "Combat SF", edited by Gordon R. Dickson. This anthology includes one of the first Hammer's Slammers stories as well as one of the BOLO stories by Keith Laumer and one of the Berserker stories by Fred Saberhagen. This anthology seems to have been the first time SF-stories specifically dealing with war as a subject were collected and marketed as such. The series of anthologies with the group title "There Will be War" edited by Pournelle and John F. Carr (nine volumes from 1983 through 1990) helped keep the category active, and encouraged new writers to add to it.