Nuclear Mercenary is a Mark III Jaeger that was built to defend the tiny, landlocked nation of San Marino from Kaiju exiting the Medditeranian Breach. San Marino is unique, being one of the few, if not the only, Medditeranian nation that uses Jaegers, as the other nations have began to use powerful versons of conventional weapons. Nuclear Merenary (Abbreviated NM) is one of the few Mark III Jaegers left, as many other nations have taken to using much more powerful Jaegers to combat the Kaiju.