The Maritime Administrator will be prepared to provide marine insurance against loss or damage by the risks of war under approved clauses on shipments of cargoes coming within one or more of the following categories:

(a) Shipped or to be shipped on any American vessel, as defined in 46 U.S.C. 53901;

(b) Shipped or to be shipped on any foreign flag vessels owned by citizens of the United States;

(c) Owned by citizens or residents of the United States, its Territories or possessions;

(d) Imported to, or exported from, the United States, its Territories or possessions, under contracts of sale or purchase by the terms of which the risk of loss by war risks or the obligation to provide insurance against such risks is assumed by or falls upon a citizen or resident of the United States, its Territories or possessions;

(e) Sold or purchased by citizens or residents of the United States, its Territories or possessions, under contracts of sale or purchase by the terms of which the risk of loss by war risks or the obligation to provide insurance against such risks is assumed by or falls upon a citizen or resident of the United States, its Territories or possessions;

(f) Shipped between ports in the United States, or between ports in the United States and its Territories and possessions, or between ports in such Territories or possessions; and

(g) Shipped or to be shipped on any foreign flag vessels, whether or not owned by citizens of the United States, if such vessels are engaged in transportation in the water-borne commerce of the United States or in such other transportation by water or such other services as may be deemed by the Maritime Administrator to be in the interest of the national defense or the national economy of the United States, when so engaged.