Jednostka Wojskowa Formoza, (Military Unit Formoza) (2007-2011 Morska Jednostka Działań Specjalnych, MJDS) (Naval Special Operations Unit), previous names: Sekcje Działań Specjalnych Marynarki Wojennej (Polish Navy Special Operations Sections), Grupy Specjalne Płetwonurków (Special Frogmen Groups).

Płetwonurków Morskich) was created in 1974 in order to develop a concept for the organisation and formation of a specialized marine sabotage division.

A three-year training system was preserved, for instance, during the first year, mainly shooting, swimming long distances, driving vehicles and foreign languages are practiced.

The current official name Formoza comes from a Polish Navy seamen nickname of unit's training base "Formoza" (from relation between mainland, coast and island like PRC and ROC Taiwan - Formosa) - a former WW2 German torpedo test platform, 500 m away from coast in Gdynia Naval Harbour (Formoza means Formosa in Polish).

Jednostka Wojskowa Formoza is prepared for special operations in times of peace, crisis and war.