Keith Urban shared an incredibly moving post during Memorial Day weekend, reflecting on what the servicemen and women of America have done for their country.MORE: Nicole Kidman receives incredible surprise from daughters during special celebrationTaking to Instagram, the Country singer, who was born in New Zealand but moved to the US in 1992, shared a beautiful picture showing wife Nicole Kidman with their two daughters in front of an American flag. WATCH: Nicole Kidman and sister Antonia have