Which situation does NOT represent one of the 10 fatal errors?

Keeping calm under pressure is a critical skill for maintaining safety and making sound decisions, particularly in high-stress situations that can arise in weapons handling and other tactical environments. This attribute is essential for a weapons officer, as it enables them to assess situations more clearly and respond appropriately without letting emotions cloud their judgment.

In contrast, the other options represent behaviors or oversights that can lead to grave mistakes in weapon handling. Making false assumptions can result in misjudgments that place personnel in dangerous situations. Failure to recognize danger signs prevents awareness of potential threats, and not watching hands can lead to accidental discharges or mishandling of firearms. These are recognized as significant errors that can lead to serious consequences in the context of weapon safety.