Boomerang (countermeasure)
Boomerang is a gunfire locator developed by DARPA and BBN Technologies primarily for use against snipers. Boomerang is mounted on mobile vehicles such as the Humvee, Stryker, and MRAP combat vehicles. There were plans to integrate it into the Land Warrior system.
Read more about Boomerang (countermeasure): Development, Operation, Related Development