The Federal Maritime Commission and the Secretary of Transportation may enter into such contracts, upon behalf of the United States, and may make such disbursements as may, in its or his discretion, be necessary to carry on the activities authorized by this chapter, or to protect, preserve, or improve the collateral held by the Commission or Secretary to secure indebtedness, in the same manner that a private corporation may contract within the scope of the authority conferred by its charter. All the Commission’s and Secretary’s financial transactions shall be audited in the Government Accountability Office according to approved commercial practice as provided in the Act of March 20, 1922 (42 Stat. 444
): Provided, That it shall be recognized that, because of the business activities authorized by this chapter, the accounting officers shall allow credit for all expenditures shown to be necessary because of the nature of such authorized activities, notwithstanding any existing statutory provision to the contrary. The Comptroller General shall report annually or oftener to Congress any departure by the Commission or Secretary from the provisions of this chapter.