Each individual who is an employee of Freedmen’s Hospital on September 21, 1961 and who transfers to Howard University shall, so long as he is continuously in the employ of Howard University, be regarded as continuing in the employ of the United States for the purposes of subchapter
III of chapter
83 of title
5, chapter
87 of title
5. For purposes of section
3121
(b) of title
26 and section
410 of title
42, service performed by such individual during the period of his employment at Howard University shall be regarded as though performed in the employ of the United States.