We do not know what you mean by "cao".
Casualty Assistance Officers and Casualty Notification Officers are required to be equal or higher rank than that of the deceased.
A CAO must hold a rank of Sergeant First Class or above. CAO stands for Casualty Assistance Officer. Normally, the CAO is a member of the casualty's unit.
6 or more
It could be Calcium Oxide, or the accronym for the US Army Casualty Assistance Officer.
To unlock Cao Cao, you must clear Musou mode with two other Wei generals
The CAO is a Casualty Assistance Officer. CAOs assist the Next of Kin of fallen service members, civilian employees, and veterans in planning and implementing the final plans of the deceased.
SFC or higher
captain and above
Cao Cao has written: 'Cao Cao shi wen xuan'
captain and above
Cao-Cao was born in 1973.