((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.