Klingon shock troops
In a fictional invasion devised by Nog during an interrogation by  Wainwright in 1947, Klingon shock troops were specialized Klingon troops employed by the Ferengi that were intended to lead the attack. 

Nog claimed that at that moment three hundred  attack cruisers were in orbit of Earth, preparing for an invasion. At the appointed hour, they were to deactivate their cloaking devices and begin transporting Klingon shock troops directly to the landing zone, which Nog unknowingly indicated to be Cleveland, Ohio. ()

Military units
Fictional