| Country | Military branches |
| Saint Kitts and Nevis | Royal Saint Kitts and Nevis Defense Force (includes Coast Guard), Royal Saint Kitts and Nevis Police Force; for national security, Saint Kitts and Nevis relies on the Regional Security System, headquartered in Barbados (2011) |
| Saint Lucia | no regular military forces; Royal Saint Lucia Police Force (includes Special Service Unit and Coast Guard) (2010) |
| Saint Martin | void |
| Saint Pierre and Miquelon | void |
| Saint Vincent and the Grenadines | no regular military forces; Royal Saint Vincent and the Grenadines Police Force, Coast Guard; for national defense, Saint Vincent relies on the Regional Security System, headquartered in Barbados (2010) |
| Samoa | no regular military forces; Samoa Police Force (2008) |
| San Marino | no regular military forces; voluntary Military Force (Corpi Militari) performs ceremonial duties and limited police support functions (2010) |
| Sao Tome and Principe | Armed Forces of Sao Tome and Principe (Forcas Armadas de Sao Tome e Principe, FASTP): Army, Coast Guard of Sao Tome e Principe (Guarda Costeira de Sao Tome e Principe, GCSTP), Presidential Guard (2010) |
| Saudi Arabia | Ministry of Defense and Aviation Forces: Royal Saudi Land Forces, Royal Saudi Naval Forces (includes Marine Forces and Special Forces), Royal Saudi Air Force (Al-Quwwat al-Jawwiya al-Malakiya as-Sa'udiya), Royal Saudi Air Defense Forces, Royal Saudi Strategic Rocket Forces, Saudi Arabian National Guard (SANG) |
| Senegal | Senegalese Armed Forces: Army, Senegalese Navy (Marine Senegalaise), Senegalese Air Force (Armee de l'Air du Senegal) (2009) |
| Serbia | Serbian Armed Forces (Vojska Srbije, VS): Land Forces Command (includes Riverine Component, consisting of a river flotilla on the Danube), Air and Air Defense Forces Command (2010) |
| Seychelles | Seychelles Defense Force: Army, Coast Guard (includes Naval Wing, Air Wing), National Guard (2005) |
| Sierra Leone | Republic of Sierra Leone Armed Forces (RSLAF): Army (includes Maritime Wing and Air Wing) (2010) |
| Singapore | Singapore Armed Forces: Army, Navy, Air Force (includes Air Defense) (2010) |
| Sint Maarten | the Royal Netherlands Navy maintains a permanent and active presence in the region from its main operating base on Curacao and through a detachment on Sint Maarten; other local security forces include a coast guard, paramilitary National Guard (Vrijwilligers Korps Sint Maarten), and Police Force (KPSM) (2010) |
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