Milczewski was born in Strzepcz near Wejherowo. He graduated from the Warsaw University in the field of economics and took up a post of secretary to mayor ("wójt") of a rural community of Rumia-Zagórze in the interwar Poland; credited with helping the town grow quicker. After the invasion of Poland by Nazi Germany, Milczewski relocated to Kraków in the southern part of occupied Poland and joined the anti-Nazi underground, "nom de guerre" Wąsowicz. In 1942 he was assigned to "Komenda Okręgu AK Kraków-Miasto" with the rank of "Podporucznik" (the Second Lieutenant). For his resistance activities he was awarded four times by the Polish government-in-exile Ministry of National Defence ("Ministerstwo Obrony Narodowej") with the Medal of Valor and the Cross of AK, locally. After the defeat of Nazi Germany Milczewski returned to Wejherowo and soon began his research into ani-Nazi resistance in Pomerania. His was thrown in prison in 1949 with the onset of the Stalinist terror in postwar Poland, and released in 1952. Milczewski was a member of the "Światowy Związek Żołnierzy Armii Krajowej" (World Union of the Home Army Soldiers). He died on 2 June 2001 at the age of 95, and was buried in Wejherowo.