This report provides U.S. war casualty statistics. It includes data tables containing the number of casualties among American military personnel who served in principal wars and combat actions from 1775 to the present. It also includes data on those wounded in action and information such as race and ethnicity, gender, branch of service, and cause of death. The tables are compiled from various Department of Defense (DOD) sources. Wars covered include the Revolutionary War, the War of 1812, the Mexican War, the Civil War, the Spanish-American War, World War I, World War II, the Korean War, the Vietnam Conflict, and the Persian Gulf War. Military operations covered include the Iranian Hostage Rescue Mission; Lebanon Peacekeeping; Urgent Fury in Grenada; Just Cause in Panama; Desert Shield and Desert Storm; Restore Hope in Somalia; Uphold Democracy in Haiti; and the ongoing Operation Enduring Freedom (OEF), Operation Iraqi Freedom (OIF), Operation New Dawn (OND), and Operation Inherent Resolve. For the more recent conflicts, starting with the Korean War, the report includes additional detailed information on types of casualties and, when available, demographics. It also cites a number of resources for further information, including sources of historical statistics on active duty military deaths, published lists of military personnel killed in combat actions, data on demographic indicators among U.S. military personnel, related websites, and relevant Congressional Research Service (CRS) reports.