Code Blue?
>Cardiac or respiratory arrest drills, signified as code blue, are performed on mannequins to ensure proper readiness in the event of real-world, medical emergencies.
>https://www.defense.gov/Multimedia/Photos/igphoto/2002496889/#:~:text=Cardiac%20or%20respiratory%20arrest%20drills,real%2Dworld%2C%20medical%20emergencies.