The Guam Flag First impressions are important. Just as people tend to size you up by your appearance, so are they inclined to judge your culture and heritage. The Guam flag is a resemblance of my culture and heritage. It is simple but indigenous to the people of Guam. Governor Roy C. Smith approved the design as the Official Coat of Arms for the territory of Guam on July 4, 1917. April 4, 1930 was the formal adoption date of the official Seal of the Territory of Guam, under the administration of Governor Willis W. Bradley. The seal was designed in the city of Agana, Guam from a scene where the diverted Agana River formerly empties into the Philippine Sea in a spot known as the Navy Yar