Szare Szeregi
Więckowski was an active member of the "Zośkowcy" Community - veterans of Battalion Zośka. He donated his personal journals and documents to the Archive of the Gray Ranks. He was also a Council Member in the Józef Piłsudski Institute of America. On July 11, 2008, Jan Więckowski died in Bryn Mawr, Pennsylvania. He was laid to rest at the Our Lady of Czestochowa Cemetery in Doylestown, Pennsylvania.