Teacher:Generate a correct and concise answer for the question based on the words in the context.
Teacher: Now, understand the problem? Solve this instance: Context : John P. Miller was a United States Navy officer who very briefly served as acting Naval Governor of Guam, serving as the 28th governor from December 8, 1922 to December 14, 1922.
Question : Which armed forces utilised the service of John P. Miller?
Student:
United States Navy