By right, memory cards are not allowed. They cite security
concerns. You may be charged if caught.
And to get an LOA just so you can use it for leisure, not going
to happen. You can try asking your officer to request for you, but
i dont think so. I tried getting an LOA for a camera only for using
during a camp event, was rejected, they asked me to try borrow one
of the camp owned cameras.
But if you want to try and bring anyway, then at your own risk.
though i agree that it is easy. Many people using the non-camera
e51 (alot of regulars too) use it with the micro sd card inside.
I've never heard of anyone getting caught.