Maanpuolustuksen Tuki ry is a national defense organization that has been supporting the economic and ideological needs of key voluntary defense organizations for over 60 years. Their main focus is centralized fundraising for voluntary defense work. The organization acquires and distributes funds for its member organizations' activities and training, as well as acts as a link between the member organizations and public administration and the business sector.

The achievements of Maanpuolustuksen Tuki ry are significant, thanks to the dedication of the members. Their member organizations include the Finnish Reserve Officers' Federation, Reserve Officers' Association, Finnish Defence and Security Industries Association, Finnish Defence Training Association, and Women's Voluntary Defence Organization. Maanpuolustuksen Tuki ry provides substantial financial support to its member organizations, totaling over €600,000 annually.

In addition to their own contributions, they also distribute state funding for voluntary defense work granted by the Ministry of Defence. With the support of Maanpuolustuksen Tuki ry, voluntary defense becomes a strong and cost-effective component of Finland's defense strategy