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By Alice Gibbs
Senior Reporter
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An April 1 memorandum issued to personnel within the Department of Defense Office of Inspector General has made it clear that while the office may adopt “Department of War” as a secondary title for branding and public‑facing materials, the term may be used only as a limited secondary title and not in legal or investigative proceedings.
The guidance underscores that executive actions authorizing the symbolic name shift do not—and cannot—override federal law or statutory authorities governing the Defense Department’s oversight and investigative functions.
The restriction affects how the Department of Defense Office of Inspector General presents itself publicly, requiring its court filings, subpoenas and criminal investigations to continue operating under the Department of Defense’s statutory name rather than the “Department of War.”
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Why It Matters
A new internal memo underscores how legal limits are being applied by the Pentagon’s oversight office in response to an executive rebranding order.
While President Donald Trump signed an executive order allowing the Defense Department to use "Department of War" as a secondary title, the guidance makes clear that the rebranding does not—and cannot—change the department’s legal identity or statutory powers.
According to the document, references to "Department of War" are carefully constrained to avoid confusion over legal authority, jurisdiction, or responsibility, particularly in court proceedings or criminal investigations.
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What To Know
The April 1 memorandum, issued by the Department of Defense Office of Inspector General, directs personnel to begin using "Department of War" secondary titles starting April 6, but repeatedly emphasizes that the change is cosmetic rather than legal.
"The use of these secondary titles does not in any way affect the primary statutory title or authorities of the DoD IG under The Inspector General Act of 1978," the guidance states.
The memo further explains that the Department of Defense Inspector General and Office of Inspector General (OIG) will use the secondary titles "Department of War Inspector General" and "Department of War Office of Inspector General" only in specified contexts, such as branding, correspondence, websites and oversight reports.
However, several critical areas are explicitly exempt. The guidance bans the use of "Department of War" in subpoenas, court filings, and legal proceedings, and prohibits the Defense Criminal Investigative Service from using the secondary title altogether.
The memo also states that existing IT systems, email domains, legal authorities, and statutory responsibilities remain unchanged, reinforcing that "Department of War" is not recognized as a legal name.
What Happens Next
Despite Defense Secretary Pete Hegseth personally replacing the bronze Department of Defense sign at the Pentagon’s river entrance in November, the memo explicitly says that no existing OIG office signage should be removed and budgeted funds can’t be used to buy DOW signs.
The guidance explicitly avoids retroactive changes and stresses the need to "minimize confusion with respect to legal, statutory, or international obligations."
Until federal law changes, the memo makes clear, "Department of War" will remain a secondary, non‑legal designation—one the Office of Inspector General is barred from using in official legal settings, regardless of executive preference.
Correction 04/17/26 4:55 a.m. ET: This article was updated to clarify that the April 1 memo applies specifically to the Department of Defense Office of Inspector General, not to the Department of Defense or Pentagon as a whole.
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