Please stop using DoD to refer to the U.S. Department of Defense. DOD is part of their brand.
"U.S. Department of Defense" and "Department of Defense" refer to the proper name and legal entity of this cabinet-level government department. Reserve these for use in formal and official correspondence, documents, reports and testimony.
In all other cases, use "Defense Department" on first reference.
The correct acronym for "Defense Department" is "DOD" with a capitalized "O" in the center; use on second reference after "Defense Department" or when the stand-alone acronym suffices depending upon use. Do NOT use "DoD."
Interestingly, the U.S. Government Publishing Office Style Manual (GPO) 2016 uses the following:
- DOC—Department of Commerce
- DoD—Department of Defense
- DOE—Department of Energy
- DOI—Department of the Interior
- DOJ—Department of Justice
- DOL—Department of Labor
- DoS—Department of State
- DOT—Department of Transportation
But congress.gov uses DOD in legislation printed by the GPO:
- H.R.185 - Veterans Affairs Transfer of Information and Sharing of Disability Examination Procedures With DOD Doctors Act
- H.R.2005 - DOD Entrepreneurial Innovation Act
Note that, like the Defense Department, the U.S. Department of State also has a Brand System, but that site is not yet complete.