Which established report must be maintained to document driver training and performance?

The DA Form 348, Equipment Operator's Qualification Record, is the established report that must be maintained to document driver training and performance. This form specifically tracks an operator's qualifications and includes information about the types of vehicles they are authorized to operate.

The DA Form 348 serves as a critical tool in ensuring compliance with training requirements and helps maintain accurate records for individuals operating Army vehicles. It captures essential data such as the dates of training, the types of equipment operated, and the results of any evaluations conducted. This documentation is essential for both accountability and operational readiness within the Army.

In contrast, other forms mentioned do not serve the same purpose. For example, the DA Form 748 is focused on the operator license record but does not detail the training and performance specific to equipment operators. The DA Form 2166 relates to evaluations of noncommissioned officers and is not relevant to driver training documentation. Lastly, the DA Form 2404 is used for equipment inspection and maintenance, which does not pertain directly to the qualifications or performance of vehicle operators. Therefore, the DA Form 348 is the correct choice for documenting driver training and performance effectively.