What will be the process if I had some failure of insurance coverage on my vehicle during my active duty?
DMV has a procedure in place to exempt you from administrative actions upon your return. You will have to provide a notarized statement that the vehicle was not used during the time in question, a copy of your military ID, proof of current insurance, and signed and dated copies of deployment and return papers, or DD-214. You can take these documents to any DMV office or mail them.
What are the required steps to be able to renew by mail?
Send the bottom of your MV-3 or OP-3 renewal notice to the address on the notice. Include a personal check or money order made payable to the 'Commissioner of Motor Vehicles' for the fee.