I'm joining the RAF, my girlfriend is upset and I want to cheer her up?

My girlfrend and I are miles away from each other. We ended up having a long-distance relationship when she moved away, and have been at it for a year. We're childhood sweethearts and best friends and breaking up is something we don't want to do. I've finished schooling and I was originally going to move to where my girlfriend was, but I am joining the RAF so that plan is not happening anymore. She was really happy about me moving to be with her, but now she is devastated, and it really pains me to see her like this. I see her every four months or so, and I'm visiting her this April, and I would like to do something for her for our anniversary. I can't decide between a Tiffany & Co. pearl necklace and a gift idea(a basket filled with her favourite DVDs(including the DVD of the first film we watched together as a couple)/CDs/books/chocolates, I don't know what else to add to that) I'm hesitant about the Tiffany's thing because I've gotten her Tiffany's 3 times in a row and some of my mates have said that it's getting a little impersonal. Anyone have a good idea? Oh and with the gift, I'm giving her a diary that I've written to her. What should I do?
--------------------
You sound so sweet! No wonder she is upset as she must miss you so much. I think you are doing the right thing in joining the RAF as it is a great way of life for you (and her later if you wed) and a great career move. If you don't join the RAF then you could live to resent your girlfriend so stick to your plans. My husband joined up when we had just got married so that did make it easier coz we got a military house within about 2 months. What about doing her a photo album of you and her and maybe adding the CDs too. great idea about the Cds. If the relationship is that serious then are you going to marry her? If yes then you would get military housing. My husband was in the RAF for 16 years. Long distance relationships can be difficult but they can also be very passionate and work. If you are very serious about her then what about an engagement ring?
Source