Care package

It’s my first time sending a care package,

I know ups has boxes you receive for free which are available in 3 sizes then you just pay and are shipped at standard rate regardless of weight .

He’s on base do I put his address as I would as if I’m sending a letter he’s a marine and I am so proud of him and miss him dearly & want to show him that I miss him and care for him

But idk how to send them out with address and idk what to NOT put in a care package