There's no way that's gonna work here. They always checked our moustache+beard when we were about to leave the barracks to "weekend holiday". You couldn't go until you had your beard shaved. I was asked to shave even though I had like 1mm stubble.
The hair doesn't have to be so short on the other hand. But no sideburns, and it has to be very short around your ears and on the back. But it can be even 1cm long on top. I never had less than 0,6cm on top.