5.4.3 Measurement system identification
A defense specification shall indicate whether its units of measurement are
in metric or inch-pound, or whether the document is not measurement sensitive
by placing one of the designations below in a rectangular box above the
specification identifier.1 Documents that include a mixture
of metric and inch-pound units shall be identified by "INCH-POUND."
1 At one time, the letters “DOD” were used in
the document identifier to designate specifications that could be used in
metric design; for example, DOD-A-12345. This policy was changed in
1988, and preparing activities were instructed to change the “DOD”
identification back to “MIL” when the specification was next revised.