For most of her reign Queen Elizabeth II maintained an establishment of two Equerries plus a Temporary Equerry: the senior Equerry was a permanent appointment (joined to the position of Deputy Master of the Household); whereas the junior Equerry (who routinely held office for three years) was appointed in turn from each of the three services of the British Armed Forces. The Temporary Equerry was a captain of the Coldstream Guards, who provided part-time attendance, and who (when not required for duty) was assigned to regimental or staff duties.
