§ 781. Libel in admiralty against or impleader of United States
A libel in personam in admiralty may be brought against the United States, or a petition impleading the United States, for damages caused by a public vessel of the United States, and for compensation for towage and salvage services, including contract salvage, rendered to a public vessel of the United States: Provided, That the cause of action arose after the 6th day of April, 1920.