Section 63: General and /or Air Officers in Amphibious operations
Regulations for the Navy Part IIICentral Regulations · 1957
In amphibious operations with either or both of the other Services, should the General and/or Air Officers Commanding the Army and/or Air Forces be embarked in a ship of war or transport, the distinguishing flag or flags authorized by Regulation 60 may be hoisted at the fore of such ship or transport to denote the presence of the headquarters.
SECTION X-PRESIDENT’S COLOUR, ENSIGN, JACK AND PENDANT