So true, for all my military friends around the world. You will never be completely at home again, because part of your heart will always be elsewhere. That is the price you pay for the richness of loving and knowing people in more than one place.
Your are your 'selfish' years. It's a decade to immerse yourself in every single thing possible. Be selfish with your time and all the aspects of you. Tinker with shit, travel, explore, love a lot, love a little and never touch the ground.