During which conflict were a higher percent of Coast Guard personnel killed than any other service?

The first World War (WWI) is noted for having a higher percentage of Coast Guard personnel killed than any other service during that conflict. The Coast Guard was significantly involved in various wartime efforts, including escorting convoys and performing search and rescue operations in treacherous conditions. At that time, the Coast Guard was still a relatively small service, which meant that the loss of personnel had a more pronounced impact percentage-wise compared to larger branches.

In contrast, during World War II, Korea, and Vietnam, the overall scale and size of military operations involved a larger number of personnel from all branches, which diluted the percentage of losses among the Coast Guard. Thus, the percentage killed in WWI stood out as uniquely high among the service members, underscoring the sacrifices made by the Coast Guard during that period.