identify businesses or organizations that must achieve six sigma quality or greater and explain why?
Most examples of the application of six sigma come from the commercial sector, but a surprising example comes form the US government sector, specifically the US Army. They utilize six sigma for a number of similar reasons, to eliminate waste and optimize services and production. More importantly the US Army is one of the largest employers in the USA , with over 1.2 million service members who are operating world wide, so all of the services, from logistics to support services to operations need to adhere to the highest quality requirements. As an example, think about critical secure communications networks that they rely on. If one vulnerability exists, then it may potentially expose thousands of service members to threats by revealing their communications to hostile forces.
https://www.army.mil/article/180826/lean_six_sigma_improving_processes_and_efficiency_in_a_high_reliability_organization
the post about 1-2 paragraph and the reply about 2-3 sentences