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.