Creative solution to personal problem

A Marine was in the service. One day he received a letter from his girlfriend back home:

Dear Ricky,
I can no longer continue our relationship. The distance between us is just too great.
I must admit that I have cheated on you twice, since you’ve been gone, and it’s not fair to either of us. I’m sorry. Please return the picture of me that I sent to you.

After reading the letter, the Marine was seriously distressed. Suddenly a saving idea dawned on him and he immediately felt relieved.

What did Ricky do?