The term 'Nonreturnable Serves' refers to a job in the service industry. The acronym 'ACES' stands for 'Assisting Customers with Exceptional Service, ' which is the primary responsibility of this position. This job involves providing customers with exceptional service, such as helping them find what they need and answering any questions they may have. Additionally, this job requires the employee to be able to handle difficult customer situations and provide solutions to their problems.