A comparison of military casualty rates across the four United States military services during the Persian Gulf War was presented. Data were obtained from the Worldwide Casualty System on all deaths that occurred in the involved area of Southwest Asia between January 17, 1991 and February 28, 1991. Of the 219 active duty military personnel that were killed during this period 154 were killed in battle and 65 died of nonbattle related causes. Army personnel accounted for 58% of the battle casualties and 71% of the nonbattle casualties. Thirteen percent of the casualties resulted from friendly fire. The highest battle casualty rate, 0.52 per 1,000, and nonbattle casualty rate, 0.31 per 1,000, were experienced by the Marine Corps. The nonbattle related deaths were due to accidents, illness, suicide, and homicide.