The Soviet Union started frogman operations during World War II. The first unit of combat divers (or RON team), was formed in Leningrad in 1941. Soviet combat divers were quite successful during World War Two. They performed a variety of missions numbering well over 200 operations. 1970 and after: frogmen from the OB PDSS operated in Angola, Vietnam, Egypt, Mozambique, Nicaragua, Ethiopia and other places, often at the request of the nation that they operated in. They went to Angola and Nicaragu