Which task is NOT a critical part of a screen mission?

Providing supply support is not a critical part of a screen mission. The primary focus of a screen mission is on reconnaissance and surveillance to maintain awareness of enemy movements, which includes tasks such as maintaining contact with the enemy and reporting their activity. These tasks are vital to ensure that friendly forces are prepared to respond appropriately to any threats.

In contrast, while logistical support is essential in military operations, it falls outside the scope of a screen mission. The purpose of a screen is to provide information and early warning rather than logistical or supply management. Engaging enemy reconnaissance units may come into play in certain contexts, but the primary objective remains on information collection and maintaining situational awareness.