Answer the following question: What key details about david allan walker  can be extracted from the following bio?  Bio: air marshal sir david allan walker , -lrb- born 14 july 1956 -rrb- is a director at strategic difference , and a former senior raf officer and master of the household to the sovereign .
Answer:
- allegiance is united kingdom- commands is raf halton raf training group- awards is knight the order of the british empire commander of the royal victorian order officer of- serviceyears is 1974-2011- birth date is 14 july 1956- name is david allan walker- branch is united kingdom- laterwork is senior extra equerry to the queen vice-patron of the royal international advisor air tattoo president of the london wing of the air at training corps vice-president of the raf club deputy lieutenant of hsbc gloucestershire . holdings master of the household- rank is air marshal