In addition to the amounts authorized by section 1928b of this title, there is authorized to be appropriated $50,000 for fiscal year 1977 to meet the expenses incurred by the United States group in hosting the twenty-second annual meeting of the North Atlantic Assembly. In addition to amounts authorized by section 1928b of this title, there is authorized to be appropriated $550,000 for fiscal year 1994 to meet the expenses incurred by the United States group in hosting the fortieth annual meeting of the North Atlantic Assembly. In addition to the amounts authorized by section 1928b of this title, there is authorized to be appropriated $450,000 for fiscal year 1984 to meet the expenses incurred by the United States group in hosting the thirty-first annual meeting of the North Atlantic Assembly. Amounts appropriated under this section are authorized to remain available until expended.