Final answer:
The combat operational stress control (COSC) leadership function 'Mitigate' is defined as addressing and reducing stressors.
Step-by-step explanation:
The combat operational stress control (COSC) leadership function Mitigate is defined as addressing and reducing stressors. In this context, mitigating stress means taking action to identify and manage the sources of stress to minimize their impact. It involves using strategies such as problem-solving, seeking support, and practicing stress reduction techniques like exercise.