| Rank | Country | Manpower reaching military service age annually |
| Sao Tome and Principe | 
male: 2,437
female: 2,394 (2008 est.) |
| Saudi Arabia |
male: 271,905
female: 261,795 (2008 est.) |
| Senegal |
male: 141,832
female: 139,541 (2008 est.) |
| Serbia |
male: 66,263
female: 62,165 (2008 est.) |
| Seychelles |
male: 770
female: 750 (2008 est.) |
| Sierra Leone |
male: 70,068
female: 73,930 (2008 est.) |
| Singapore |
male: 27,742
female: 26,325 (2008 est.) |
| Slovakia |
male: 38,183
female: 36,388 (2008 est.) |
| Slovenia |
male: 10,516
female: 9,934 (2008 est.) |
| Solomon Islands |
male: 6,924
female: 6,679 (2008 est.) |
| Somalia |
male: 95,446
female: 95,339 (2008 est.) |
| South Africa |
male: 529,201
female: 522,678 (2008 est.) |
| South Georgia and the South Sandwich Islands | void |
| Southern Ocean | void |
| Spain |
male: 203,650
female: 191,352 (2008 est.) |
| Spratly Islands | void |
| Sri Lanka |
male: 174,065
female: 168,593 (2008 est.) |
| Sudan |
male: 488,679
female: 469,547 (2008 est.) |
| Suriname |
male: 4,329
female: 4,350 (2008 est.) |
| Svalbard | void |
| Swaziland |
male: 15,951
female: 15,728 (2008 est.) |
| Sweden |
male: 64,605
female: 61,110 (2008 est.) |
| Switzerland |
male: 49,205
female: 45,220 (2008 est.) |
| Syria |
male: 215,734
female: 203,106 (2008 est.) |
| Taiwan |
male: 164,883
female: 152,085 (2008 est.) |
| Tajikistan |
male: 84,137
female: 81,777 (2008 est.) |
| Tanzania |
male: 478,812
female: 479,557 (2008 est.) |
| Thailand |
male: 531,315
female: 511,288 (2008 est.) |
| Timor-Leste |
male: 13,045
female: 12,670 (2008 est.) |
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