Interallied  Confederation
of  Reserve Officers

Confédération   Interalliée
des  Officiers de Réserve

World’s largest and oldest military reserve officers' organization committed to advise and support NATO on Reserve matters, promote Reserve Service and foster professional development of reserve Officers.

Goals

To support the policies of NATO and assist in the achievement of the Alliance’s objectives

CIOR is a voice for reserve issues to the NATO Alliance and provides advice on the best utilization of reserve forces in a variety of operational settings, in addition to studying and promoting harmonization in the roles, duties and rights of reservists in Allied nations.

Promote the role and importance of reserves in NATO and National level

CIOR raises awareness of contemporary reserve issues by bringing its collective expertise to promote and enhance cooperation and interoperability amongst reserve forces within the Alliance and its partners.

Foster the professional development of reserve Officers

CIOR is an organization committed to professional development, and provides a variety of high-caliber and cost-effective programs that benefit individual Reservists, their member nations, and NATO as a whole.

About

Interallied Confederation of Reserve Officers

Founded in 1948 by the reserve officer associations of Belgium, France and the Netherlands.

Commonly referred to by its French acronym CIOR (Confédération Interalliée des Officiers de Réserve) is a formal NATO-affiliated, non-political and non-profit umbrella organization of member nations’ National Reserve Associations.





 

Past and coming events

  • Winter Meeting, Brussels, Belgium, 29/01/2025 - 31/01/2025
  • YRO Seminar, Constanta, Romania, 06/05/2025 - 10/05/2025
  • IBM 2, Oslo, Norway, 08/05/2025 - 10/05/2025
  • CIOR Language Academy, Sweden, 14/07/2025 - 28/07/2025
  • CISOR Military Skills Competition, Säkylä, Finland, 25/06/2025 - 28/06/2025
  • CIMEX, Toledo, Spain, 25/07/2025 - 28/07/2025
  • YRO Workshop, Madrid, Spain, 26/7/2025 - 02/08/2025
  • Summer Congress, Madrid, Spain, 28/07/2025 - 01/08/2025
  • IBM 3, München, Germany, 23/10/2025 - 25/10/2025
  • International Cyber Event, 27/11/2025
  • Winter Meeting, Norfolk Virginia, USA, 27/01/2026 - 29/01/2026
  • YRO Seminar, Brasov, Romania, 21/04/2026 - 25/04/2026
  • IBM 4, Dijon, France, 07/05/2026 - 09/05/2026
  • CIOR Language Academy, TBD
  • Summer Congress, Bucharest, Romania, 03/08/2026 - 07/08/2026
CIOR represents the interests of 1.3 million reservists across 30 participating nations within and beyond NATO, making it the world’s largest military reserve officers organization. 

CIOR is structured around a constitution that provides for a rotating Presidency; Executive Council; key Committees and several annual events that promote training, education and professional development.

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CIOR

Founded in

1948

Reservists

1.3 mln

Nations

30

Activities

Military Competition

3-day competition designed to test all of the key infantry skills - shooting, obstacle course, utility swimming and orienteering with additional tasks like range estimation, map reading and hand grenade throwing.

Young Reserve Officers Programme

YRO Seminar and YRO Workshop are designed to be a Young Reserve Officer’s first exposure to a multinational environment of NATO and to increase awareness of Alliance security issues.

Civil-Military Cooperation Exercise

3-day table-top Civil-Military Cooperation Exercise demonstrating Civil-Military liaison skills, collaboration and information sharing on emerging NATO challenges and promoting best practices and professional development.

CIOR Language Academy

Intensive, 2-week course that teaches English and French as a second language with STANAG testing at the end of the course.

International Cyber Event

Event which provides a secure and safe environment to share experiences and information regarding military and civilian cyber, in order to facilitate cybersecurity support to NATO members during cyber operations.

CIOR Symposium

1-day symposium on Reserve issues with speakers at the highest political, military, and academic levels. The speakers address issues such as mobilization and Reserve readiness, demobilization and repatriation of Reservists to their home countries and civilian jobs and appropriate utilization of civilian specialists for peace support operations.

CIOR Winter Seminar

3-day academic conference that serves as a platform for current geopolitical issues with a specific emphasis on the relevance of Reservists.

Members

CIOR represents 30 participating nations

CIOR has 27 member and 3 associate countries which are represented by their National Reserve Officers Associations.

Only NATO member countries can be CIOR members, however, other countries can be associates.
Every CIOR member country is represented by one organisation which must be endorsed by the country’s MoD with confirmation that this is the sole organisation representing all their Reserves.

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News

All news

Early Bird Applications for the CLA 2026

The CIOR Language Academy will take place between 20 - 31 July 2026. This is a two week intensive English and French language course, focusing on military language, and fostering interoperability between NATO members. 
You will find more details on the CLA 2026 webpage. 

Applications will close on 10 May 2026. 

Early bird applications will be processed sooner to allow participants to make their travel plans earlier. Early bird applications will close on Friday 24 April at 1100hrs. 

Fill your application now.

Decoration of Past CIOR President

Past CIOR President received highest military decoration from the President of the Republic of Estonia.

The 2024 Conference Achievement of the Year was granted to the CIOR/CIOMR/CISOR Summer Congress 2024

A formal appreciation event was held at Mövenpick Hotel Tallinn, where the City of Tallinn and the Estonian Convention Bureau announced the recipient of the Conference Achievement of the Year award and recognized the most outstanding conferences held in Tallinn in 2024.

Reserve Officer Association of Ukraine joins CIOR as associate member

The Ukrainian Association of Reserve Officers and Veterans (UAROV) has been approved for associate membership in CIOR. This announcement comes during the annual Midwinter Meeting of CIOR.

Presidential visits with the leadership of Mallorca

Nordic Presidency Leads Amidst Tragedy and Diplomacy

Estonia gave over CIOR chairmanship to Nordic countries

Estonian reserve officers gave over chairmanship of CIOR to joint Nordic presidency on 2nd August, 2024.

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