| Rank | Country | total | Manpower reaching military service age annually |
| 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.) |
| Togo | |
male: 69,156
female: 69,200 (2008 est.) |
| Tokelau | | void |
| Tonga | |
male: 1,464
female: 1,412 (2008 est.) |
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