Code KB MO MF MH MG MD AO AF Definition intermediate levels of mainte- nance. Item included in both a depot overhaul/repair kit and a Main- tenance kit. Item to be manufactured or fabricated  at  organizational level. Item to be manufactured or fabricated  at  intermediate  main- tenance levels. Air Force -   Intermediate (*) Army -  Direct Support (*) Marine  Corps   - 4th Echelon Navy  - Afloat Item to be manufactured or fabricated  intermediate  mainte- nance  levels. Air Force -   Intermediate (*) Army -   General Support (*) Marine  Corps   - 4th Echelon Navy -  Ashore Item to be manufactured or fab- ricated at both afloat and ashore intermediate  maintenance  levels - Navy use Item to be fabricated level. Item to be only. manufactured  or at depot maintenance assembled at organi- zational level. Item to be assembled at inter- mediate  maintenance  levels. Air Force -   Intermediate (*) Army -  Direct Support (*) Marine Corps   - 3rd Echelon Navy  - Afloat AH - AG - AD - TM5-6115-634-14&P NAVFAC  P-8-647-14&P T0-35C2-3-445-14 TM-6115-14&P/1 Item to be assembled at inter- mediate  maintenance  levels. Air Force -   Intermediate (*) Army -   General Support (*) Marine  Corps   - 4th Echelon Navy  - Ashore Item to be assembled at both afloat and ashore intermediate maintenance  level   - Navy use only. Item to be assembled at depot maintenance  levels. (*) NOTE : For USAF and the USA Safe- guard Program, only Code “F” will be used to denote intermediate maintenance. On joint programs use of either code F or H by the joining service will denot intermediate  maintenance  USAF  and  the USA Safeguard Program. XA - XB - XC - XD - Do not requisition an “XA’’-coded item. Order its next higher assembly. (Also refer to NOTE below.) If an “XB” item is not available from salvage, order it using the FSCM and part number given. Installation  drawing,  diagram, instruction  sheet,  field  service drawing, that is identified by manufacturer’s  part  number. Item is not stocked. Order an “XD’’-coded  item  through  normal supply channels using the FSCM and part number given, if no NSN is  available. NOTE : Cannibalization  or  controlled exchange, when authorized, may be used as a source of supply items with the above source codes, except for those source coded “XA” or throse aircraft support  items  restricted  by  requirements of AR 700-42. (2)  Maintenance  Code.  Maintenance codes tells you the level(S) of mainte- nance authorized to USE and REPAIR sup- F-3