I want to know the answer to the following question:
What type of postal service does Guam currently have today?
All the background I'm provided with is that "Because Guam is also part of the U.S. Postal System (postal abbreviation: GU, ZIP code range: 96910–96932), mail to Guam from the U.S. mainland is considered domestic and no additional charges are required.". Is that enough to answer the question?
Answer: no