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.