This is typically recommended for a company that does not have an established NDT Department or is expanding its NDT Department. This would require more involvement from a Responsible Level 3 till the inspectors have completed their OJT hours that are required for them to become certified by their employer.
Examples would be adding a new method of NDT. Taking on outside work that has different requirements from your standard work. Creating and maintaining documents as needed, such as training records, inspection logs and other required records as needed
Spending time with the new inspectors until they are completely confident with the new inspections they are being tasked to perform.