The U.S. Merchant Marine is a fleet of privately owned ships that act as an auxiliary arm of the military, transporting troops and supplies during wartime. This series contains a list prepared by the Marine and Seamen's Division of the Bureau of War Risk Insurance of casualties and ships during World War I. The list is in five parts:
- Schedule A: Officers and Seamen in the American Merchant Marine ― Killed, wounded, or captured since the beginning of the World War, as the result of war risks, July 1, 1914–June 30, 1919 on American merchant vessels, whether or not they were covered by war risk insurance which went into effect on June 12, 1917.
- Schedule B: Civilians working on merchant vessels owned or operated by any department or agency of the United States government and killed, wounded, or captured by war hazards, April 6, 1917–November 15, 1918.
- Schedule C: Enlisted personnel of the U.S. Navy on merchant vessels killed, wounded, or captured by war hazards, April 6, 1917–November 15, 1918.
- Schedule D: (a) Officers and Seamen in the American Merchant Marine ― Who died or were disabled on account of disease and causes other than marine and war risks ― On vessels whose crews were insured by the Marine and Seaman's Division; and (b) memorandum of deaths of American Seamen ― From records of U.S. Public Health Services ― July 1, 1914, to June 30, 1919.
- Schedule E: The fifth, and largest, lists seamen and officers of the Merchant Marine lost or disabled by marine hazards in each of the fiscal years, 1915–1919.
Entries in the schedules can include the name of the vessel, the place and date of the loss, the names and addresses of the vessel's owners, the nationality and rating of each seaman or officer lost on each vessel, the name and address of next of kin, the nature of the casualty, and a total of the number of vessels and men concerned.