If your leaving i would drain the fuel and dispose of it, i store my cars and leave everything else in, fluids that is depends on how long i let them sit.

Disconnect your battery, i would take it right out and store off the vehicle if possible.

drian the e85 or buy the e85 stable
make sure every thing is full brake,oil,coolant,p.s.
I also pickle the engines if they sit for a long time. just pull the plugs and put a little oil down the holes.
take the battery out of the car.

hey man welcome to the fleet.

Leave it with me,I'll take care of it for you!!

If you can leave it is someone's care,somewhat,put stabilizer in the fuel,and have them start it every week,let it get to operating temp,etc.

If not,drain the tank,run it til it stalls,put it inside under a car cover,up on jack stands so the tires don't get flat spots,and go do what you have to do,and be safe out there.

Welcome to the navy man. Honestly there is some pretty good advice in here, you'll need it again once you go on deployment .