The 51st Battalion, Far North Queensland Regiment (51 FNQR) is a light infantry battalion of the Australian Army. The battalion serves as a Regional Force Surveillance Unit (RFSU), carrying out reconnaissance and surveillance tasks as its primary role. Every operator in the unit is cross-trained in a variety of "low-visibility" skills such as weapons, survival, sniping, medic, small boat handling, driving, tracking, air ops etc. It is the only battalion of the Far North Queensland Regiment, and draws its lineage from an Australian Imperial Force (AIF) battalion, which was raised for service during World War I.