There is hereby established the Canaveral National Seashore Advisory Commission which shall consult and advise with the Secretary on all matters of planning, development, and operation of the seashore and shall provide such other advice and assistance as may be useful in carrying out the purposes of sections 459j to 459j–8 of this title. The Commission shall terminate ten years after the date the seashore is established pursuant to sections 459j to 459j–8 of this title, unless extended by the Congress. The Commission shall be composed of six members who shall serve for terms of two years. Members shall be appointed by the Secretary, one of whom he shall designate as Chairman, in the following manner: