Which cyberspace domain is used for offensive and defensive cyber operations (OCO/DCO)?

The cyberspace domain that is used for offensive and defensive cyber operations (OCO/DCO) is the Sensitive Compartmented Information Facility (SIPR). This network is specifically designed to handle classified information and support the secure communication needs of military and government operations.

SIPR allows for the transmission of classified data, which is essential for planning and executing cyber operations. Because cyber operations often involve sensitive and classified information, utilizing a network like SIPR ensures that communications are secure and that operational integrity is maintained.

In contrast, JWICS is primarily used for handling top secret information and airborne intelligence operations, while NIPR is designed for unclassified communication. The Defense Information System Network (DISN) provides a range of services but does not focus specifically on the needs surrounding offensive and defensive cyber operations. Thus, SIPR stands out as the most appropriate cyberspace domain for these types of military cyber activities.