Coo coo coo coo coo......(too tired to speak)

Coo coo coo coo coo coo (make a sad sound)

Cuckoo (so tired)

Summary: The military training is so tiring...I'm so tired that I'm too lazy to write a leave note...Anyway, everyone knows what's going on, right! ? In short, when my military training is over, everything will be ok!