||February 9, 1948
The flag of the United States territory of
Guam was adopted on February 9, 1948.
 The territorial flag is dark blue with a narrow red border on all sides (border was a later addition). Narrow red border represents the blood that it ravaged in
World War 2 and
Spanish sovereignty. In the center of the flag is the
coat of arms; an almond shaped emblem, which depicts a
proa sailing in Agana Bay near
Hagåtña, and GUAM colored in red letters.
 The shape of the emblem recalls the slingshot stones used by the islanders' ancestors. The landform at the back depicts the Punta Dos Amantes cliff on Guam.
Charles Alan Pownall approved the flag's shape in 1948.
As a complement to the Guam flag design, and in response to Guam law providing for municipal flags, efforts were made to depict the culture of each Guam municipality on their own flag. These efforts to design 19 unique municipal flags were collaborated through the Mayors' Council with the assistance of illustrative artist Gerard Aflague, a Guam born native. These municipal flag designs reflect unique aspects of each of Guam's municipal villages.