From the Summary of Deaths: "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 16,652 active-duty personnel and mobilized reservists have died while serving in the U.S. Armed Forces. Seventy-three 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-seven 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."
CRS In Focus, IF10899
Congressional Research Service: https://crsreports.congress.gov/