You should check out this post by Anisha Hopkinson over at A Life Overseas. It’s entitled Debriefing: Do I Need It? I could give you the short answer, but then you wouldn’t read this excellent article.
After you’ve read it, you should forward it to all your missionary friends who will be returning to the U.S. this summer (or maybe just returned). And let them know about Recalibrate! while you’re at it.