A Marine on sentry duty may apply deadly force when guarding an area containing?

A Marine on sentry duty is authorized to apply deadly force in situations where their duty involves protecting nuclear weapons. This is due to the extreme risk and potential consequences associated with the unauthorized access or use of nuclear materials. The policy emphasizes that nuclear weapons require the highest level of security because of their destructive capabilities and the potential for catastrophic outcomes if they fall into the wrong hands.

While the other choices may involve important assets or resources that require protection, they do not carry the same level of urgency or potential for catastrophic consequences as nuclear weapons. Thus, the rules of engagement that guide the use of deadly force are specifically tailored to reflect the gravity involved in securing nuclear arsenals.