Which type of training does NOT contribute to maintaining proficiency?

Overtraining does not contribute to maintaining proficiency because it can lead to physical and mental exhaustion, which eventually hampers a soldier's ability to perform tasks effectively. Unlike sustainment training, which focuses on keeping skills sharp, or simulated training scenarios that allow practice in a controlled environment, overtraining pushes soldiers beyond their limits without sufficient recovery, often resulting in a decline in performance rather than an enhancement of it. Moreover, ongoing feedback sessions are integral to identifying areas for improvement and reinforcing skills, thus further emphasizing the detrimental effects of overtraining on overall proficiency.