Final answer:
Special Access Programs (SAPs) are used to protect sensitive classified information. A program whose purpose, existence, and specific details are all classified is likely an unacknowledged SAP (USAP), designed for exceptionally stringent security measures.
Step-by-step explanation:
The SAP protection level you are asking about refers to a Special Access Program. Special Access Programs (SAPs) in the United States are established to control access, distribution, and protection for sensitive classified information that is considered extraordinarily vulnerable.
Within the Department of Defense and certain other federal agencies, SAPs are used to protect information concerning particularly sensitive technologies, capabilities, or activities. The specific level of SAP protection where the purpose, existence, and specific details are all classified would likely be unacknowledged SAPs (USAPs), which are a subset of SAPs with even stricter access and information controls. In such programs, even the acknowledgment of their existence is restricted and safeguarded. USAPs ensure a more compartmentalized security protocol to prevent unauthorized disclosure, which could have significant consequences for national security.