The Structure of the Postal Service is discussed extensively in the book "Postal Service Labor Arbitrations" by John Zodrow in Denver. Basically, the Postmaster General (PMG) is the chief executive officer and is named by, and serves at the pleasure of, the USPS Board of Governors, as does the deputy PMG. The Board of Governors oversee the Post Office, now know as the Postal Service. Nine of the 11 Governors of the Board are appointed by the President of the United States, plus the PMG and Deputy PMG. Rate changes, however, are overseen by the Postal Rate Commission, an independent federal agency.
The United States Postmaster General is responsible for day-to-day oversight and operational oversight for the U.S. Postal Service. Additional guidance and oversight is provided by the Board of Governors of the United States Postal Service, of which nine members are appointed by the President of the United States, and confirmed by the Senate.
Armed Services Committee
NO
Oversee should be oversees because committee is singular
Quality review committee
The committee on ways and means oversees taxation and Social Security.
(Committee on Armed Services)
Committee on science, space, and teachnology .
Committee on Armed Services
It deals with numerous matters including the U.S. archives, the post office, and the civil service.
A group who oversees and guides the progress of new ideas, systems etc.
House Financial Services Committee http://financialservices.house.gov/
Most major sports have a committee or other structure that oversees rules and practices. For instance, the NFL is an organization that oversees American football.