word | | Military branches |
| Obrana | Bosnia and Herzegovina | Bosnia and Herzegovina Armed Forces (OSBiH): Army of Bosnia and Herzegovina, Air and Air Defense Forces of Bosnia and Herzegovina (Zrakoplovstvo i Protuzracna Obrana, ZPO) (2007) |
| Office | Gambia, The | Office of the Chief of Defense: Gambian National Army (National Guard, GNA), Gambian Navy (GN) (2008) |
| Oglaigh | Ireland | Irish Defense Forces (Oglaigh na h-Eireann): Army (includes Naval Service and Air Corps) (2008) |
| Ohuvagi | Estonia | Estonian Defense Forces: Land Force, Navy, Air Force (Eesti Ohuvagi), Volunteer Defense League (Kaitseliit, KL) (2008) |
| Oman | Oman | Sultan's Armed Forces (SAF): Royal Army of Oman, Royal Navy of Oman, Royal Air Force of Oman (2008) |
| Operational | Denmark | Defense Command: Army Operational Command, Admiral Danish Fleet, Island Command Greenland, Tactical Air Command, Home Guard (2008) |
| Operational | Macedonia | Army of the Republic of Macedonia (ARM): Joint Operational Command, with subordinate Air Wing (Makedonsko Voeno Vozduhoplovstvo, MVV), Special Operations Regiment (2007) |
| Operations | Australia | Australian Defense Force (ADF): Australian Army, Royal Australian Navy, Royal Australian Air Force, Special Operations Command (2006) |
| Operations | Belgium | Belgian Armed Forces: Land Operations Command, Naval Operations Command, Air Operations Command (2008) |
| operations | Iran | ... defense); Islamic Revolutionary Guard Corps (Sepah-e Pasdaran-e Enqelab-e Eslami, IRGC): Ground Forces, Navy, Air Force, Qods Force (special operations), and Basij Force (Popular Mobilization Army); Law Enforcement Forces (2008 |
| Operations | Iraq | Iraqi Armed Forces: Iraqi Army (includes Iraqi Special Operations Force, Iraqi Intervention Force), Iraqi Navy (former Iraqi Coastal Defense Force), Iraqi Air Force (former Iraqi Army Air Corps) (2005) |
| Operations | Jordan | ... Royal Jordanian Navy, Royal Jordanian Air Force (Al-Quwwat al-Jawwiya al-Malakiya al-Urduniya), Special Operations Command (Socom); Public Security Directorate (normally falls under Ministry of Interior, but comes under JAF ... |
| Operations | Macedonia | Army of the Republic of Macedonia (ARM): Joint Operational Command, with subordinate Air Wing (Makedonsko Voeno Vozduhoplovstvo, MVV), Special Operations Regiment (2007) |
| Operations | Papua New Guinea | Papua New Guinea Defense Force (PNGDF; includes Maritime Operations Element, Air Operations Element) (2008) |
| Operations | Romania | Land Forces, Naval Forces, Romanian Air Force (Fortele Aeriene Romane, FAR), Special Operations (2008) |
| Operations | Serbia | Serbian Armed Forces (Vojska Srbije, VS): Land Forces Command (includes Serbian naval force, consisting of a river flotilla on the Danube), Joint Operations Command, Air and Air Defense Forces Command (2007) |
| Operations | South Africa | South African National Defense Force (SANDF): South African Army, South African Navy (SAN), South African Air Force (SAAF), Joint Operations Command, Military Intelligence, Military Health Service (2008) |
| Oruzane | Croatia | Armed Forces of the Republic of Croatia (Oruzane Snage Republike Hrvatske, OSRH), consists of five major commands directly subordinate to a General Staff: Ground Forces (Hrvatska Kopnena Vojska, HKoV), Naval Forces (Hrvatska ... |
| OSBiH | Bosnia and Herzegovina | Bosnia and Herzegovina Armed Forces (OSBiH): Army of Bosnia and Herzegovina, Air and Air Defense Forces of Bosnia and Herzegovina (Zrakoplovstvo i Protuzracna Obrana, ZPO) (2007) |
| OSRH | Croatia | Armed Forces of the Republic of Croatia (Oruzane Snage Republike Hrvatske, OSRH), consists of five major commands directly subordinate to a General Staff: Ground Forces (Hrvatska Kopnena Vojska, HKoV), Naval Forces (Hrvatska ... |
| Ozbrojene | Slovakia | Armed Forces of the Slovak Republic (Ozbrojene Sily Slovenskej Republiky): Land Forces (Pozemne Sily), Air Forces (Vzdusne Sily) (2005) |
| Pakistan | Pakistan | Army (includes National Guard), Navy (includes Marines and Maritime Security Agency), Pakistan Air Force (Pakistan Fiza'ya) (2008) |
| Palace | Monaco | no regular military forces; the Palace Guard performs ceremonial duties |