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Reserves and Paramilitaries: The Troops Beyond the Active Force

Ukraine lists 4 million reservists, South Korea 3.1 million, and India 2.5 million paramilitary personnel. Why the troops not on active duty can matter most.

Explainers, , 2 min read

Active-duty numbers get most of the attention, but in a major war, many countries would rely just as heavily on two other groups: reservists, who have military training and can be called up, and paramilitary forces, which sit somewhere between the army and the police.

Reserves

Ukraine tops the list with about four million reservists, a figure shaped by wartime mobilisation and by the large pool of men who have served since 2014. South Korea has about 3.1 million, the result of compulsory service for all men: almost every South Korean man has served and remains a reservist for years afterwards. Taiwan (1.66 million) relies on a similar system and has recently lengthened its conscription period to one year.

Russia lists about two million reservists. In 2022 it carried out a โ€œpartial mobilisationโ€ of some 300,000 of them to replace losses in Ukraine.

Israel is perhaps the clearest example of a reserve-based military. Its active force is about 169,500, but it can call up some 465,000 reservists within days, as it did after the attacks of October 7, 2023.

At the other end, several professional militaries have very small reserves. The UK, France, Italy, Spain and Australia each list fewer than 45,000. Saudi Arabia lists none.

Paramilitary forces

Paramilitaries are armed forces that are not part of the regular military, such as border guards, internal security troops and gendarmeries. India has by far the largest, at about 2.5 million, more than its active army. They include the Border Security Force and the Central Reserve Police Force, among others, which handle border security and counter-insurgency.

Chinaโ€™s 625,000 paramilitary personnel are mostly in the Peopleโ€™s Armed Police, which handles internal security and also commands the coast guard. Iranโ€™s paramilitary figure includes the Basij, a volunteer militia under the Revolutionary Guard. Franceโ€™s National Gendarmerie and Italyโ€™s Carabinieri are military police forces with both civilian and military roles.

Adding it all up

Combine all three and the ranking changes. Ukraine (about 5.0 million) and India (about 4.96 million) lead, followed by South Korea (3.67 million), Russia (3.57 million) and China (3.17 million).

Why reserves matter

Wars that last longer than a few months are won or lost on the ability to replace losses. Russiaโ€™s invasion of Ukraine showed that professional armies can be depleted quickly, and both sides have depended on calling up reserves and conscripts.

But a reservist is only as useful as their training and equipment. Many countries list large reserves that have not trained in years and have no weapons set aside for them. Several European countries, including Germany, are now debating or rebuilding forms of national service partly to address this.

Compare personnel side by side: North Korea vs South Korea, China vs Taiwan or Russia vs Ukraine.