Stack, John F. of Waukesha, passed away peacefully on Tuesday, February 21, 2017 at Season's Hospice at the age of 91. He was born on July 16, 1925 in Walsenburg, CO, the son of John and Clara O. Stack. John was a Captain in the U. S. Air Force and proudly served our country for 18 1/2 years during World War II and the Korean Conflict. In 2011, he attended the Milwaukee Honor Flight to Washington D.C. Along with training and aiding in the installation of radar equipment in Italy for the U.S. Military and General Electric, John continued working for General Electric in the Medical Systems division in Milwaukee for 33 years. After retirement, John was a mentor for Junior Achievement and volunteered for Milwaukee Schools and taught Computer Skills for retirees at WCTC. John enjoyed being with his family, traveling, researching genealogy, geology, gardening and painting. John will be dearly missed by his wife of 65 years, Clara M.; children, Julie Ann (Keith) Buchanan, Fred (Glory) Stack, Patricia (Gary) Browning, Michael (Sherry) Stack, and Paul (Christine) Stack; grandchildren, Amy (Soor-el) Puga, Andy, James, Nicholas (Georgia), Ashley, Matthew, Kelly, Sam, Nathan, and Mark; great-grandchildren, Aiden and Evan Puga. He is further survived by other relatives and friends. John was preceded in death by his parents, brother, and sister. The first visitation for John will be held on Friday, February 24, 2017 from 5:00 PM until 7:00 PM at Cesarz, Charapata & Zinnecker Funeral Home, 237 N. Moreland Blvd. Waukesha, WI. 53188. The Rosary will begin at 6:30 p.m. on Friday. The second visitation will take place on Saturday, February 25, 2017 from 10:00 AM until 10:45 AM at St. William Catholic Church, 440 N. Moreland Blvd. Waukesha, WI. 53188. The memorial mass will immediately follow at 11:00 AM. Entombment with full military honors will immediately follow at St. Joseph Catholic Cemetery. In lieu of flowers, memorials are appreciated to Waukesha Catholic School Systems and Memorial High School, 601 E College Ave, Waukesha, WI. 53186. John's family would like to thank Season's Hospice in Waukesha and Heartland Hospice in Milwaukee for their care and support.