Ratio of military to civilian casualties: selected major conflicts of the 20th and 21st centuries*
| Conflict | Civilian/military deaths |
|---|---|
| Russo-Japanese War (1904–1905) | 0.16 |
| World War I (1914–1918) | 0.72 |
| World War II (1939–1945) | 1.71 |
| Korean War (1950–1953) | 3.09 |
| Vietnam War (1964–1973) | 2.17 |
| Invasion/occupation of Iraq (2003–) | 7.78 |
↵* Total military deaths in selected conflicts 39 961 000; total civilian deaths in selected conflicts 56 728 000.