If you were to go like to Office Supplies and buy some labels, MOST come with a program to use where you can type on them and them print them out or just google the "brand" and "type" and then you can download the program for them.
I am also in the military and I am stationed in Arizona and my boys live in Texas. I found this and showed it to my boys and they love it. The youngest one is 8 and the oldest is 14 and I let them each take charge in finding one and they each have found three they want to look for when they come here for the summer.