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The following shows the number of men who were inducted into military service through the Selective Service System during the major 20th century conflicts.
| World War I | Sept. 1917 – Nov. 1918 | 2,810,296 |
| World War II | Nov. 1940 – Oct. 1946 | 10,110,104 |
| Korean War | June 1950 – June 1953 | 1,529,539 |
| Vietnam War | Aug. 1964 – Feb. 1973 | 1,857,304 |
| Year | Number of Inductions |
| 1917 | 516,212 |
| 1918 | 2,294,084 |
| 1940 | 18,633 |
| 1941 | 923,842 |
| 1942 | 3,033,361 |
| 1943 | 3,323,970 |
| 1944 | 1,591,942 |
| 1945 | 945,862 |
| 1946 | 183,383 |
| 1947 | 0 |
| 1948 | 20,348 |
| 1949 | 9,781 |
| 1950 | 219,771 |
| 1951 | 551,806 |
| 1952 | 438,479 |
| 1953 | 471,806 |
| 1954 | 253,230 |
| 1955 | 152,777 |
| 1956 | 137,940 |
| 1957 | 138,504 |
| 1958 | 142,246 |
| 1959 | 96,153 |
| 1960 | 86,602 |
| 1961 | 118,586 |
| 1962 | 82,060 |
| 1963 | 119,265 |
| 1964 | 112,386 |
| 1965 | 230,991 |
| 1966 | 382,010 |
| 1967 | 228,263 |
| 1968 | 296,406 |
| 1969 | 283,586 |
| 1970 | 162,746 |
| 1971 | 94,092 |
| 1972 | 49,514 |
| 1973 | 646 |
