As described in
paragraph 2.1.1,
all persons in DEERS have a primary identifier, the EDIPI, which DEERS
officially calls the DoD ID. The DoD Identification Number is a
DEERS-assigned 10 digit number and is recorded on all official DoD
CAC/ID cards. This DoD Identification Number replaces the SSN for use
in identification for all activities and transactions authorized
by DoD, unless the use of SSN is specified by law. The DoD Identification
Number allows the Military Health System (MHS) to track a person
through their life span under a single identifier. Changes in role
or relationship to a sponsor is reflected in the DBN, see
paragraph 2.3.