After returning to the United States in 1947, Menster returned to reserve duty and was assigned to Saint Mary's Church in Corwith, Iowa. He also served as the national chaplain of the
AMVETS organization. Menster was assigned to be the pastor of St. Patrick's Church in, Monona, St. Mary's in Waverly, and St. John's in Clarion in 1958. While there, he was the chaplain of the U.S. Naval Training Center in Dubuque. By 1968, Menster had attained the rank of
Commander. Menster was named the pastor of the
St. Donatus parish in 1978. After Menster retired from active ministry, he lived in Dubuque. At the time of his death on April 14, 2007, Menster was the oldest living priest in the
Archdiocese of Dubuque. == Legacy ==