Keystone company

Keystone company appeared in Chicago, Illinois in Resistance 2 not mcuh is known about them since they only appeared for exactly ten seconds before their VTOL was hit by the Leviathan and collided into a wall.

Trivia
Even though they collided into a wall, if you look there just after the Leviathan tries to eat you for the first time there is no sign of damage to the wall or any sign of a VTOL anywhere.