auxiliary ship

(A) with respect to a contract entered into after December 20, 2019, does not include an icebreaker or a special mission ship; and

(B) with respect to a contract entered into on or after the date of the enactment of the National Defense Authorization Act for Fiscal Year 2025, includes an icebreaker or a special mission ship, unless the Secretary of the Navy certifies to Congress that the forecasted sales over a four-year period of large medium-speed diesel engines manufactured in the national technology and industrial base will not fall below the minimum sustaining rate for plant operations of a diminishing manufacturing source.