KR Three-Seven was piloted by Samantha Byrne and accompanied Damon S. Baird and Augustus Cole to Speyer to support Marcus Fenix, JD Fenix, Kait Diaz, and Del Walker with DB Industries mech suits. KR Three-Seven provided air support for JD and Kait as they piloted the mech suits through the Swarm-occupied ruins of the Tollen town center en route to Tollen Dam. Upon reaching the defunct dam's depleted reservoir, the group found the entrance to the Swarm nest guarded by a massive Swarm creature. While JD and Kait used their mechs to disable and sever the creature's tentacles, KR Three-Seven fired missiles into the resulting wounds, inflicting severe damage. The creature then launched several Cankers from its chest cavity, two of which struck KR Three-Seven and forced it down. Its passengers e