The chairman's post was lying vacant for over two years after the death of the founder-chairman of the NSCN(IM), Isak Chishi Swu on June 28, 2016 while the post of vice chairman fell vacant following the demise of Kholi Konyak on December 12, 2018.
Both Tuccu and Wangnao were elected for a tenure of six years, a release issued by the NSCN(IM) said.
NSCN (IM) general secretary, Th. Muivah, on Monday declared the two names at Camp Hebron, the faction's headquarters, the release said.
The NSCN(IM) is in ceasefire with the Centre since 1997 and negotiations are on to resolve the seven-decade-old Naga political problem.
A framework agreement was also signed between the Centre and the NSCN (IM) in August 2015.
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