The total number of military personnel killed in World War II is estimated to be between 70 and 85 million. This number includes both those who died in combat and those who died as a result of disease, starvation, or other causes related to the war. The vast majority of these casualties were suffered by the countries involved in the war in Europe and Asia, with an estimated 55-65 million deaths in Europe and 20-25 million deaths in Asia.
These numbers are based on a variety of sources, including official records, casualty estimates, and historical research. However, due to the incomplete and often fragmentary nature of the data available, it is difficult to determine a precise figure for the number of military personnel who died during World War II.