Formally, E-9 billets for the senior enlisted advisor are established at service unit (e.g., battalion, wing, or higher), command, major command, force, or fleet levels to the SEAs/CSELs of DoD Agencies and the Senior Enlisted Advisor to the Chairman of the Joint Chiefs of Staff.
In the Air Force a first sergeant can be an E7, E8 or E9, depending on size and mission of the unit, and is a temporary, special duty assignment.
On 20 June 2023 the Chief of the Defence Force General Angus Campbell announced the creation of the position of Senior Enlisted Advisor to the Chief of the Defence Force (SEAC) and that the outgoing Joint Operations Warrant Officer, Warrant Officer Ken Robertson would assume the position effective 1 July 2023.
The Army, Navy and Air Force each have their own Chief Warrant Officer acting as Senior Enlisted advisor.
there is also the Senior position within HQNZDF of the Warrant Officer of the Defence Force (WODF)