Note that the most senior Warrant Officer in each of the three services is appointed and promoted to either
Warrant Officer of the Navy (WO-N),
Regimental Sergeant Major of the Army (RSM-A), or
Warrant Officer of the Air Force (WOFF-AF), as appropriate. Although these are positional appointments, these three members hold the rank of Warrant Officer in their respective services and each wear special insignia, different from the rank insignia worn by other warrant officers. In 2023 the E10 position of Senior Enlisted Advisor to the Chief of the Defence Force (SEAC) was created. This position can be staffed by a member from any of the three services and is rotational. The RAN and the RAAF have two warrant officer ranks, the army has three. The soldier appointed Regimental Sergeant Major of the Army (RSM-A) holds the unique Army rank of Warrant Officer (introduced in 1991 and senior to WO1). The Army rank of WO2 is the equivalent of the RAN and the RAAF's most senior NCOs, (i.e. Chief Petty Officer and Flight Sergeant). As Army WO2s hold a Warrant, while the RAN CPO and RAAF FSGT do not, WO2s are addressed as "Sir" or "Ma'am" by junior ranks, which extends to OCDTs and SCDTs. ==Non-Commissioned Officer ranks==