Jackals

The Jackals are one of the three groups of raiders that originated from Vault 15, the other ones being the Khans and the Vipers. They most likely came out of the Vault in the 2100s.

They are your typical group of crazies. They have no morals except one: survival. They use group tactics to overmatch their enemies. They are craven cowards, though, and will not attack unless they know they can win. They band together in their hideaway and fight over the spoils. They also fought extensively against the other two raider groups from Vault 15, until they were defeated by the Khans in 2135. After that, most of them fled East of California.

Appearances in games
The Jackals eventually did not appear in any of the games, but they were mentioned by Ian and Killian Darkwater in Fallout 1. According to a Duck and Cover interview with Sean K. Reynolds, the Jackals were to appear in Van Buren.