Today is 10/4/2016. Let me say it again without the year. 10/4. Did you notice it yet? Ok, Let me say it in a different way. " 10-4, Boss." ....Alright, Let me explain it, When the operator gives you a order and you receive it by vehicle, You say "10-4". It means that you understand what to do. Its also the reason why today is 10/4. I'll let that sink into your head. If you don't know, Google it.