TMEP § 1204.02
Flags and coats of arms are specific designs formally adopted to serve as emblems of governmental authority. The wording "other insignia" should not be interpreted broadly, but should be considered to include only those emblems and devices that also represent governmental authority and that are of the same general class and character as flags and coats of arms.
The following are insignia of the United States for purposes of §2(b):
The Trademark Trial and Appeal Board has construed the statutory language as follows:
[T]he wording "or other insignia of the United States" must be restricted in its application to insignia of the same general class as "the flag or coats of arms" of the United States. Since both the flag and coat or [sic] arms are emblems of national authority it seems evident that other insignia of national authority such as the Great Seal of the United States, the Presidential Seal, and seals of government departments would be equally prohibited registration under Section 2(b). On the other hand, it appears equally evident that department insignia which are merely used to identify a service or facility of the Government are not insignia of national authority and that they therefore do not fall within the general prohibitions of this section of the Statute.
In re U.S. Dep't of the Interior, 142 USPQ 506, 507 (TTAB 1964) (finding logo comprising the words "NATIONAL PARK SERVICE" and "Department of the Interior," with depiction of trees, mountains, and a buffalo, surrounded by an arrowhead design, not to be an insignia of the United States). The Trademark Trial and Appeal Board reaffirmed this interpretation in In re Peter S. Herrick, P.A., 91 USPQ2d 1505 (TTAB 2009), by affirming the §2(b) refusal since applicant’s seal design was virtually identical to the seal used by the United States Department of the Treasury.
Examples: The following are examples of insignia that should be refused under §2(b):
Great Seal of the United States 
Seal of The President of The United States 
The Official Seal of a Government Agency 
Designs that do not rise to the level of being emblems of national authority, or emblems of state or municipal authority, should not be refused. Exception: As a result of the enactment of Public Law 98 525 on October 19, 1984, the initials, seal, and emblem of the United States Marine Corps are "deemed to be insignia of the United States," under 10 U.S.C. §7881. The amendments adding this section do not affect rights that vested before October 19, 1984. Applications claiming use after October 19, 1984 must be refused.
The following are examples of designs that are not barred from registration under §2(b):
Designs That Identify Governmental Departments - No §2(b) Refusal


Monuments, Statues, Buildings - No §2(b) Refusal



Objects Used By The Government - No §2(b) Refusal


Words or Initials that Identify People or Departments in The Government - No §2(b) Refusal
The following cases provide examples of matter that was held not to be government insignia under §2(b):