The declaration was made by state Minister for Information and Public Relations Lal Thanzara at a simple function.
The 90-year-old soldier-turned-journalist started editing his own newspaper in 1970 and was elected the president of MJA for three terms.
He co-founded the Association for Voluntary Blood Donation in Mizoram as its general secretary and was later elected its president for a number of times from 2001 onwards.
Pachuau's contribution in this field has earned him three special awards of State Blood Transfusion Council, not to mention the numerous state awards.
He has also held the post of President, World War-II Veteran Association, on numerous occasions.