(a) Time
No payment shall be made pursuant to this subchapter to carry out any research or training over a period in excess of two years, except that with the concurrence of at least two-thirds of the members of the Board of the Center such research or training may be carried out over a period of not to exceed five years.

(b) Items excluded
Assistance pursuant to this subchapter shall not cover the cost of land acquisition, construction, building acquisitions, or acquisition of major equipment.

(c) Former Government employees
No individual formerly in the employment of the Federal Government shall be eligible to receive any assistance pursuant to this subchapter, or to serve as a trustee of the Center in the two-year period following the termination of such employment.