§ 1180. Vessels eligible to subsidy
An operating-differential subsidy shall not be paid under authority of this subchapter on account of the operation of any vessel which does not meet the following requirements:
(1) The vessel shall be of steel or other acceptable metal, shall be propelled by steam or motor, shall be as nearly fireproof as practicable, shall be built in a domestic yard or shall have been documented under the laws of the United States not later than February 1, 1928, or actually ordered and under construction for the account of citizens of the United States prior to such date, and shall be documented under the laws of the United States, during the entire life of the subsidy contract; and
(2) if the vessel shall be constructed after June 29, 1936 it shall be either a vessel constructed according to plans and specifications approved by the Secretary of Transportation and the Secretary of the Navy, with particular reference to economical conversion into an auxiliary naval vessel, or a vessel approved by the Secretary of Transportation and the Navy Department as otherwise useful to the United States in time of national emergency.