The following is the June 1, 2018 Congressional Research Service In Focus Report, Recent Trends in Active-Duty Military Deaths.
From the Report
Since 2006—five years after the start of major combat operations in Afghanistan and three years after the U.S.-led invasion of Iraq—a total of 15,851 active-duty personnel and mobilized reservists have died while serving in the U.S. armed forces.
Seventy-two percent of these casualties occurred under circumstances unrelated to war, a category classified in this report as Non-Overseas Contingency Operations, or Non-OCO. Twenty-eight percent have died while serving in OCO operations—primarily within the territory of Iraq and Afghanistan—during periods of active combat operations. OCO operations related to Afghanistan primarily include Enduring Freedom and Freedom’s Sentinel. For Iraq, OCO operations include Iraqi Freedom, New Dawn, and Inherent Resolve.