Keeping enough trained workers for wartime missile production

How would a missile manufacturer maintain staff quality for production lines held in reserve?

Employ more trained workers than normal output requires and rotate them through active production, supported by staffing exercises and experience across different jobs.

The initial proposal rotates extra staff through the active production line so that skills remain current. Keeping those workers employed is treated as part of the cost of maintaining wartime capacity. Dan suggests periodically removing some staff for training or other activities so that the remaining team practices working at the expected wartime staffing level. A different emphasis is placed on moving people among multiple lines and jobs to develop broader skills. The discussion accepts that several approaches could be combined.