What are some good ideas for "Open When" cards?

My amazing boyfriend is going to be leaving for marines in January and I would like to get started on these letters. I want to be a be able to send as many as possible so he knows that I'm still here patiently waiting for him to come home. I want to give him support in the letters and to let him know how proud we all are and how much we miss him. If you have any ideas please tell me:)

Report as