Eligibility requirements Section 3345 of title 5, United States Code, is amended as follows: (1) In subsection (a)— (A) in paragraph (1), by adding before the semicolon at the end the following: , but, and except as provided in subsection (e), only if the individual serving in the position of first assistant has occupied such position for a period of at least 30 days during the 365-day period preceding the date of the death, resignation, or beginning of inability to serve of the applicable officer