checks, are completed not later than 270 days after the date on which an eligible noncitizen submits all required materials to apply for such visa. (B) Rule of construction Notwithstanding subparagraph (A), the Secretary of State, the Secretary, or the Secretary of Defense may take longer than 270 days to complete the steps incidental to issuing a visa under this section if the Secretary of State, the Secretary, or the Secretary of Defense, or a designee— (i) determines that the satisfaction of national security concerns requires additional time