Final answer:
The final disposition authority for cancelling HYT waivers generally resides with the senior leadership or a designated board within the military organization, as guided by their specific regulations and laws.
Step-by-step explanation:
The question pertains to the final disposition authority in the context of cancelling High Year Tenure (HYT) waivers within a military organization. It is important to understand that HYT is a policy that determines the maximum number of years an individual can serve in a particular rank before they must either be promoted or retire. Waivers to this policy may be granted under exceptional circumstances. However, the authority to grant or cancel such waivers ultimately falls to the military's senior leadership or board within the organization, guided by the specific regulations and laws that govern service commitments and tenure. The final disposition authority would typically be outlined in the military's personnel management directives or regulations, which vary by country and service branch.