What does 'SUNRISE' indicate in relation to C2 sensors?

The term 'SUNRISE' signifies that C2 sensors are operational and functioning as intended. In the context of military operations, maintaining situational awareness and understanding the status of command and control (C2) systems is crucial for effective decision-making and coordination. When C2 sensors are marked 'SUNRISE,' it indicates that they are active and providing data or intelligence necessary for the operation. This encompasses their ability to detect and track enemy movements or other relevant phenomena critical to mission success.

The other options do not align with the definition of 'SUNRISE.' For instance, an indication of maintenance or degradation would imply that the sensors are not fully operational or may be experiencing issues, which contrasts with the notion of them being 'operational.' Similarly, suggesting that sensors are not available would indicate a complete loss of functionality, whereas 'SUNRISE' explicitly confirms their readiness for use. Thus, the distinction lies in the terminology used, where 'SUNRISE' serves as a positive affirmation of operational capability.