America's wars in Afghanistan and Iraq have taken a heavy toll on both service people and their families. Children growing up without a parent; husbands and wives separated; parents wondering every day if they'll ever see their sons or daughters again. For many military families, this almost unbearable strain makes the moment they're finally reunited that much sweeter. Increasingly, these moments are being captured on tape giving rise to the surprise soldier homecoming video. National Geographic reveals the human stories and emotional first moments captured on film as loved ones are finally reunited.