Interallied  Confederation
of  Reserve Officers

Confédération   Interalliée
des  Officiers de Réserve

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


Provide advice on Reserve issues to the NATO Military Committee

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-calibre and cost-effective programs that benefit individual Reservists, their member nations, and NATO as a whole.


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.
CIOR represents the interests of over 1,3 million reservists across 34 participating nations within and beyond NATO, making it the world’s largest military reserve officer 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.



Founded in



1,3 mln




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 junior Reserve Officer’s first exposure to a multinational environment of NATO and increases 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 in the end of the studies.

International Cyber Event

Event 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 Seminar

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


CIOR represents 34 participating nations

CIOR has with 28 member and 6 associate countries who are reprasented 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.


2023 CLA announced - CLA is back!

CIOR Language Academy Summer 2023 in Defence Academy of UK

Romania organized a virtual workshop “Identified Lessons from the Ukrainian Conflict”

On 23 March 2023, the Centre for Defense and Security Strategic Studies (CDSSS) from the National Defence University "Carol I" (ROU NDU) organized, together with the Romanian Reserve Officers Association, a virtual Workshop aimed at analysing the first year of the Russian-Ukrainian conflict... 

Summer Congress in Helsinki in the making

The 4th of April 2023 marks an important date by being the day when Finland becomes a NATO member. At the same time the preparations for the annual summer congress of NATO’s reserve officers’ organization CIOR are on their way and as many as five hundred...

CIOR helps junior reserve officers get the experience needed to serve in a multinational HQ

Every reserve officers career will most likely come to a point where there is an opportunity to serve in a multinational headquarter. It is a great opportunity for junior reserve officer to develop their skills and get to the next level in their career but also a great responsibility and a challenge.

One year of war in Ukraine, 105 years of Independent Estonian Republic

  February 24th was the 105th anniversary of Estonian Republic. The same day marks one year of Russia´s illegal aggression against Ukraine. President of European Commission Ursula von der Leyen  and Secretary General of NATO and Jens Stoltenberg  visited Tallinn...

France agreed to deliver the French-made AMX 10-RC light combat tanks to Ukraine

In early January, French president Emmanuel Macron committed to provide the Ukrainian forces with French armor, and the 1981 AMX10RC will arrive within 2 months. They have seen action in the Gulf War, Afghanistan and Sahel, and are equipped with a 105mm gun and 7.62mm...