Three sets of conversion guides contain cross references between DoD domain codes (data item codes) and Accredited Standards Committee (ASC) X12 domain code values. DoD systems that store internal data in DoD format and exchange data via X12 EDI/XML based transactions must implement the conversion guides for Transportation Method/Type Codes and Unit of Materiel Measure (Unit of Issue/Purchase Unit) to convert outbound DoD data values to the corresponding ASC X12 code values and vice versa for inbound data values.