What do single soldiers do about mail while on deployment?

I found out that single soldiers can always have mail sent to their home unit and it will be forwarded.

They can fill out a United States Postal Service form to have their mail forwarded to them. Or They can have the Post Office hold onto their mail till they return state side. Have them check with their command. The unit post office. Of if they live off base to check with the post master. They can also sign up for a P.O.Box and have the mail collected there till they return. But of course let the POST Office know that you will be deployed so they don't close down the box. Hope this helps..

I ultimately opened a P.O. Box as I did not want my junk mail and hoped that anything regarding finances came to me.

You will get a APO address when you are deployed and the mail will be picked up by your unit and delivered to you.

Your unit will have an APO / FPO address that you can use normally, and the mail room just forwards everything normally.

As an example:

Aaron Kennedy
3/1
Camp Pendleton CA ZIP

becomes

Aaron Kennedy
BLT 3/1
FPO AP ZIP