Argentina
All three branches of the Armed Forces of the Argentine Republic use two or three ranks of corporal, or cabo. Corporals in the Argentine military are considered suboficiales subalternos (subaltern sub-officers/lower non-commissioned officers), superior only to all ranks of Volunteers (enlisted members of the Army and Air Force) and Seamen (enlisted members of the Navy).
In the Argentine Army, there are two ranks of corporal, junior and senior: Cabo (Corporal) and Cabo Primero (First Corporal).
While the Argentine Navy has three Corporal ranks, from junior to senior: Cabo Segundo (Corporal Second Class), Cabo Primero (Corporal First Class) and Cabo Principal (Principal Corporal), which is equal to the Army rank of Sargento (Sergeant). The Air Force has the same number of Corporal ranks as the Navy, and keeps the same titles, with the exception of Cabo (Corporal) instead of the Navy's Cabo Segundo (Corporal Second Class).
The rank is also used by the Argentine National Gendarmerie and the Argentine Federal Police, which use the rank in the same manner as the Army, as well as the Argentine Naval Prefecture.
Read more about this topic: Corporal