Where is all training progression for trainees in upgrade training documented?

The correct answer is the 623A, which is specifically designed for documenting the training progression of trainees who are in upgrade training. This form serves as an official record that captures the entire training process for an individual, outlining their competencies, skills, and any additional progress made during their training period.

The 623A is vital in ensuring that all aspects of a trainee's development are tracked systematically. It also facilitates communication between instructors and trainees about what skills have been mastered and what areas may need further attention. This ensures trainees are progressing in line with the standards outlined for their specific roles and responsibilities.

While options like the Training Progress Report and Standard Training Plan might provide information on a trainee's overall development, they do not serve the specific purpose of documenting progression in the structured manner that the 623A does. The Training Evaluation Form typically focuses on assessing performance rather than documenting the ongoing progression of skills and training milestones. Thus, the 623A is the key document for maintaining a clear and comprehensive record of a trainee’s development throughout their upgrade training process.