What does the marking "TOP SECRET//RD//NOFORN" indicate?

The marking "TOP SECRET//RD//NOFORN" indicates that it includes both Control Markings and Dissemination Control Markings. "TOP SECRET" is a level of classification that denotes the highest level of sensitivity for national security information. The “//RD” denotes that the information is related to a specific type of restricted data, often associated with nuclear weapons or materials, which adds a layer of control over how the information is handled and shared. The “//NOFORN” marking specifies that the information may not be shared with foreign nationals, providing strict dissemination controls.

Together, these markings establish a clear understanding of the information's sensitivity and the handling requirements, thus fulfilling both aspects of Control Markings and Dissemination Control Markings. Understanding this distinction is crucial for ensuring the appropriate levels of protection and compliance with regulations regarding classified information handling.