Appointments in the RAOC Prior to 1981 / 82 the RAOC , in common with the rest of the Army , used the idiosyncratic system of staff titles that was unique to British and most Commonwealth armies . After 1981 in NATO assigned units , principally those in British Army of the Rhine , the standard NATO system was adopted with all appointments elsewhere changing the following year . List of appointments . The senior RAOC appointment was Director Equipment and Ordnance Stores ( DEOS ) − always a major - general − which during 1920s became Director Ordnance Services ( DOS ) . DOS was also a title given to senior RAOC officers at major commands such as Middle East Command , 21st Army Group and in more recent times BAOR . After the Somerville Logistic Reorganisation Committee Report of 1977 the head of the corps was re - titled Director General Ordnance Services ( DGOS ) . Following the huge expansion of the RAOC in the Second World War the senior RAOC major general was designated Controller Ordnance Services ( COS ) from 1942 to 1948 Deputy Director Ordnance Services ( DDOS ) usually a brigadiers ' appointment were found in the War Office ( MOD after 1964 ) and in large headquarters throughout the Army . Chief Ordnance Officer ( COO ) was a brigadiers ' or colonels ' appointment and was used as an alternative to DOS , e . g . COO United Kingdom Land Forces Colonel Ordnance ( Col Ord ) a title principally used in MOD , this title was retained in DGOS after 1981 despite the fact that Supply was in general use elsewhere . Assistant Director of Ordnance Services ( ADOS ) usually a lieutenant colonel ' s , but occasionally a colonel ' s , appointment on the staff . Deputy Director of Ordnance Services ( DADOS ) a major ' s appointment on the staff . Corps Commander Royal Army Ordnance Corps ( CCRAOC ) a unique title for the brigadier in 1 ( British ) Corps held for only one year until the appointment was retitled Comd Sup 1 ( Br ) Corps . Commander Royal Army Ordnance Corps ( CRAOC ) a lieutenant colonel - occasionally a colonel in UK districts - and senior RAOC officer in a two star headquarters . Brigade Ordnance Officer ( BOO ) an officer , usually a captain , attached to a brigade . Brigade / District Ordnance Warrant Officer ( B / DOWO ) a warrant officer 1st class - frequently a conductor - attached to a headquarters . Chief Ammunition Technical Officer ( CATO ) the senior ammunition officer in a large headquarters and was usually a lieutenant colonel , in a smaller headquarters the appointment was called Senior Ammunition Technical Officer ( SATO ) and usually held the rank of major . Before 1942 the senior Ordnance Mechanical Engineer in a headquarters was designated Principal Ordnance Mechanical Engineer ( POME ) . Until 1920 the AOC and later RAOC , in common only with the Royal Engineers , maintained a rank of Second Corporal . After 1980 / 1 most of these titles disappeared with the notable exception of CATO / SATO and DOWO / BOWO . All RAOC appointments gave the staff grade ( e . g . Staff Officer Grade 2 : SO2 suffixed with the word Sup ) , the head of corps in a headquarters irrespective of rank was titled Comd Sup . In MOD the titles of DGOS and DDOS were retained .