Lots of Porsches get stored here in the NEast so we have experience with these things.
You want a.....
Fresh change of oil moments before storing (that way its totally clean inside while sitting for a year). Do NOT start & run it, as you only accumulate condensation in the motor from repeated warming & cooling cycles.
Full tank of fuel w Stabil-izer.
Add about 10 extra lbs of air in the tires.
A good cleaning & wax job.
A good dust cover to keep it clean so when you arrive home it will still look spectacular.
A big rubber mat under the car.
Mothballs or Dried Mint leaves (from a health food store) will keep the critters out. (Perhaps your wife or someone can replenish them in about 6 mos when they have lost their zing.) Also will help to tape over the intake snout and tailpipe for the same reason.
Disconnect the battery or better still pull it and use it in another vehicle & buy a new one when you return.
Don't worry about brake fluid until you return, upon which time you should flush & fill w new Ate Blue or Ate Gold or similar.
I think thats it.
Be safe.
Thank you for your service to our beloved country.
Len Cummings