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Colonel John Nevin Rentz

A young man in a Marine Corps uniform.
  • Unit: 1st Marine Division, 1st Battalion, Company C
  • Date of Birth: December 7, 1917
  • Entered the Military: October 28, 1941
  • Date of Death: November 6, 1976
  • Hometown: Lancaster, Pennsylvania
  • Place of Death: Bethesda, Maryland
  • Award(s): Purple Heart, Silver Star, Bronze Medal
  • Cemetery: Section P, Site 45. Baltimore National Cemetery, Baltimore, Maryland
Contributed by Zen Aiken and Colten Clarke
Mentored by Mrs. Amie Dryer
The Calverton School
2025/2026

Early Life

John Nevin Rentz was born on December 7, 1917, in Rohrerstown, Lancaster County, Pennsylvania, and was baptized in 1918 at Salem United Church of Christ in Lancaster. He was the only child of Reverend Adam Frederick Rentz, a minister of the German Reformed Church, and Leanora Clark Sweigert Rentz. 

He attended Lancaster Boys High School, graduating in 1934, where he was active in debating, theater, music, and student leadership. He served as captain of the debating team, sang first tenor in the Glee Club, participated in the senior play, and worked as the Features Editor for the school yearbook staff. 

Rentz continued his education at Franklin and Marshall College in Lancaster, where he graduated in 1937. While at F&M, he remained active in campus life, competed on the wrestling team, and participated in the Green Room and Glee Club. He later continued his studies at Pennsylvania State University before he entered military service in 1941.

John Nevin Rentz’s Birth Certificate, 1917. Commonwealth of Pennsylvania.
Rentz (center) graduated from Lancaster Boys High School in 1934. Lancaster Boys High School.
Rentz wrestled as a student at Franklin & Marshall College. He weighed 118 pounds. Franklin & Marshall College, January 10, 1937.

Homefront

Rentz’s hometown, Lancaster, Pennsylvania, is a historic city in southeastern Pennsylvania. It is known for its strong agricultural base, industrial production, and deep civic traditions. Before and during World War II, Lancaster was a community shaped by patriotism, education, religion, and public service. The schools Rentz attended, Lancaster High School for Boys and Franklin and Marshall College, reflected the city’s values of leadership and duty. Even before the United States entered the war, Lancaster residents and college communities were already following events in Europe with concern, especially its German immigrants. 

Lancaster contributed to the war effort through industry, agriculture, education, and military preparation. Local manufacturers shifted quickly into wartime production. Armstrong Cork Company produced military materials, including shells, airplane fuselage assemblies, gaskets, and gun-turret enclosures. Hamilton Watch Company manufactured marine chronometers and hundreds of thousands of military watches, earning the Army-Navy “E” Award for excellence in war production. 

Lancaster County also played an important role in agriculture. The 1943 film Farmer at War documented how Lancaster farmers increased food production during wartime, while residents supported conservation efforts through rationing and Victory Gardens. Life in Lancaster during World War II demanded sacrifice, adaptation, and constant civic involvement. Families navigated ration books, point systems, shortages, blackout rules, and civic defense measures. War bond drives, Red Cross work, scrap and salvage campaigns, and neighborhood block surveys involved thousands of local men and women. 

In 1943, more than 1,000 Lancaster residents served as Block Leaders, helping organize local war work. Women took on larger roles in factories and volunteer organizations, and labor shortages opened more opportunities for women as young men left for military service. Lancaster’s colleges changed as well. Franklin and Marshall’s campus was transformed by military training programs, such as housing Navy V-12 cadets.

An explanation from the federal government showing people how to shop using the point rationing system, February 19, 1943. Special Collections Research Center, Temple University Libraries (P774126B).
Armstrong Cork Company workers making camouflage nets in Lancaster, c.1944. Lancaster History Archives (2-06-05-07).
Children at Edward Hand Playground with a stand to sell war bonds, July 25, 1944. Lancaster Recreation Commission Photograph Collection, Lancaster History (LR-02-02-12).

Military Experience

Rentz voluntarily entered military service in February 1941, first joining the United States Navy before transferring into the United States Marine Corps in October 1941. After completing officer training at Marine Corps School in Quantico, Virginia, he was commissioned as a second lieutenant. 

By early 1942, the Lancaster newspaper reported his commission and assignment as the United States mobilized for war. Rentz deployed overseas with the 1st Marine Division, arriving in the Pacific theater during the early stages of the Allied offensive against Japan. 

From June 1942 until September 1944, he served in the South Pacific, including combat operations during the Solomon Islands campaign. Rentz fought at Guadalcanal, one of the first major Allied offensives against Japanese forces in the Pacific. During the fighting, he was wounded and later received the Purple Heart and the Silver Star for gallantry in combat. 

During and after these campaigns, Rentz served in several operational and staff roles as a Marine officer. His duties included amphibious embarkation planning, regimental staff work, and combat leadership with Marine infantry units. In addition to battlefield duties, he was sometimes tasked with unusual investigative work connected to intelligence and battlefield conditions. In one instance, as described in his own papers, Rentz followed orders originating from Admiral Chester Nimitz to investigate reports of cannibalism among isolated Japanese forces in the Solomon Islands. Rentz and other Marines documented evidence to confirm the reports, an example of the harsh, extreme conditions of the Pacific theater. 

Rentz continued serving in the Pacific through the final stages of World War II and returned to the United States in 1946. After the war, Rentz helped preserve the history of the Marine Corps’ campaigns in the Solomon Islands. Drawing on his firsthand experiences and operational records, he authored two official historical books for the Marine Corps: Bougainville and the Northern Solomons (1948) and Marines in Central Solomons (1952). These works documented the difficult island campaigns fought by Marine forces in the Pacific and helped ensure that the experiences of the men who fought there were recorded for future generations. 

Rentz left active duty on November 9, 1946, but continued serving in the United States Marine Corps Reserve for many years. During the Korean War, he returned to active duty and served in several leadership roles within the 1st Marine Division, including embarkation officer, regimental staff officer, and battalion commander. Over the course of his long military career, Rentz rose through the ranks and eventually retired from the Marine Corps Reserve as a colonel in 1968. His service spanned two major conflicts and reflected a lifelong commitment to the Marine Corps. 

Rentz registered for the draft while a student at the University of Pennsylvania. Portions have been redacted for privacy reasons. National Archives and Records Administration.
Rentz wrote a document summarizing his military and civilian work experiences, including this memory of an investigation ordered by Admiral Nimitz. Courtesy of Fred Rentz.
Bougainville and the Northern Solomons by Major John N. Rentz, 1948.

Veteran Experience

Following his wartime service, Rentz built a civilian career as an economist for the U.S. Department of Commerce, where he worked for more than two decades. He held several senior positions in economic development and public works programs, including Chief of Program Administration at the Economic Development Administration. 

Rentz met his wife, Mary Francis “Fran” Rood, on a blind date. They married in 1949 and settled in Bethesda, Maryland, where they raised their two sons, John (Jay) and Frederick (Fred). The family remained in Bethesda for the rest of Rentz’s life. 

Outside of his professional work, Rentz remained active in his community. He was involved in several civic and fraternal organizations, including the Freemasons’ National Sojourners Lodge and his fraternity, Chi Phi.

Rentz married his wife, Fran Rood, in 1949. Lancaster New Era, January 21, 1949.

Commemoration

Colonel John Nevin Rentz died on November 6, 1976, in Bethesda, Maryland, following a sudden heart attack. He is buried at Baltimore National Cemetery in Baltimore, Maryland. His wife, Mary, lived until 2017. They are buried together.

Rentz served the United States with distinction during both World War II and the Korean War. Beyond his military service, he contributed to the historical record of the Pacific theater through his published works, ensuring that the experiences of Marines in those campaigns would be preserved for future generations.

The Washington Post published an obituary when Rentz passed away on November 8, 1979.
The final resting place of Colonel John Nevin Rentz at Baltimore National Cemetery in Baltimore, Maryland, March 23, 2026. Courtesy of Amie Dryer.

Bibliography

Primary Sources

“13 County Men Are Known Casualties: 12 Are Listed As ‘Missing,’ One Killed.” Lancaster New Era [Lancaster, Pennsylvania], July 15, 1942.

“95 to 100 P.C. Stay on War Jobs Here After V-E Day.” Lancaster New Era [Lancaster, Pennsylvania], May 17, 1945.

“Actors at Locale of Cloister Play: Play Originally Presented at State College Will Go On Friday Night to Aid War Bond Drive.” Sunday News [Lancaster, Pennsylvania], April 4, 1943.

“A. Fred Rentz, Ex-McCaskey Principal, Dies.” Lancaster New Era [Lancaster, Pennsylvania], October 16, 1961, pages 1-2.

“Charter Celebration a Tribute From Free People Fighting To Uphold Past Traditions.” Lancaster New Era [Lancaster, Pennsylvania], June 13, 1942.

“City Board No. 2.” Lancaster New Era [Lancaster, Pennsylvania], November 15, 1940.  

“Col. J.N. Rentz, 58, City Native, Dies in Bethesda.” Lancaster Sunday News [Lancaster, Pennsylvania], November 7, 1976. 

“Complete Survey of Every Home To Aid War Work on Home Front.” Sunday News [Lancaster, Pennsylvania], May 30, 1943.

“Engaged.” Lancaster New Era [Lancaster, Pennsylvania], March 17, 1942.  

“Facts on Rationing.” Lancaster New Era [Lancaster, Pennsylvania], August 8, 1942.

Farmer at War. 1943. Directed by War Activities Committee of the Motion Picture Industry & Columbia Pictures. Video. [11:00]. Indiana University Moving-Image Archive. https://media.dlib.indiana.edu/media_objects/ww72bb72q.

Franklin and Marshall College. The Franklin and Marshall Alumnus 16, no. 1 (September 1939): 2. https://digital.fandm.edu/islandora/franklin-and-marshall-alumnus-vol-16-no-01.

Franklin and Marshall College. The Franklin and Marshall Alumnus 16, no. 1 (September 1939): 7. https://digital.fandm.edu/islandora/franklin-and-marshall-alumnus-vol-16-no-01.

Franklin and Marshall College. The Franklin and Marshall Alumnus 17, no. 1 (September 1940): 3. https://digital.fandm.edu/islandora/franklin-and-marshall-alumnus-vol-17-no-01.

Franklin and Marshall College. The Franklin and Marshall Alumnus 18, no. 2 (December 1941): 1. https://digital.fandm.edu/islandora/franklin-and-marshall-alumnus-vol-18-no-02.

“Gifts Your Man in Uniform Can Use.” Intelligencer Journal [Lancaster, Pennsylvania], September 6, 1944.

“Jane Callender Engaged to Wed.” The Tribune [Scranton, Pennsylvania], March 14, 1942. Newspapers.com (528938983).

“John N.Rentz, Ex-Economist For Commerce.” The Washington Post [Washington, D.C.], November 8, 1979. 

John Nevin Rentz. Application for World War II Compensation. Digital Images. https://ancestryclassroom.com.

John Nevin Rentz. Certificate of Birth. Digital Images. https://ancestryclassroom.com

John Nevin Rentz, Freedom of Information Act Record, Department of the Navy, National Archives and Records Administration – St. Louis.

John Nevin Rentz, Lancaster, Pa., 118 Pounds. Photograph. Sunday News [Lancaster, Pennsylvania]. January 10, 1937, p. 8.

John Nevin Rentz, Official Military Personnel File, Department of the United States Navy. National Archives and Records Administration – St. Louis.

John Nevin Rentz. Salem United Church of Christ Baptism Records. Digital Images. https://ancestryclassroom.com.

John Nevin Rentz. World War II Draft Cards Young Men, 1940-1947. Digital Images. https://ancestryclassroom.com. 

John Nevin Rentz. U.S. Department of Veterans Affairs BIRLS Death File, 1850-2020. Digital Images. https://ancestryclassroom.com.

Lancaster High School Yearbook. Lancaster: School District of Lancaster, 1932. 

Lancaster High School Yearbook. Lancaster: School District of Lancaster, 1934.

Lancaster New Era [Lancaster, Pennsylvania], November 14, 1942.  

“Local War Chronology.” Lancaster New Era [Lancaster, Pennsylvania], December 7, 1945.

“Manheim Plans Commencement: Exercises to Be Held June 3, at the High School.” Lancaster New Era [Lancaster, Pennsylvania], May 26, 1943.

“Marriage License Applications: Rentz–Rood.” Lancaster New Era [Lancaster, Pennsylvania], January 21, 1949. Newspapers.com (560818161)

Mennonites food for Europe. 1945. Pearl Digital Collection, Digital Public Library of America. https://digital.history.pcusa.org/islandora/object/islandora%3A356972. 

“Military Ballot Total Now 11,251; Final Report In.” Intelligencer Journal [Lancaster, PA], July 10, 1944.

“Officer in Marines.” Lancaster New Era [Lancaster, Pennsylvania], February 3, 1942.  

OPA Shows How to Shop Under New Point Rationing System. Philadelphia Evening Bulletin [Philadelphia, PA], February 19, 1943. George D. McDowell Philadelphia Evening Bulletin Photographs Collection, Temple University Library (SCRC 170). https://digital.library.temple.edu/digital/collection/p15037coll3/id/48815.

Pennsylvania. Lancaster County. 1920 U.S. Census. Digital Images. http://ancestryclassroom.com.

Pennsylvania. Lancaster County. 1930 U.S. Census. Digital Images. http://ancestryclassroom.com.

Pennsylvania. Lancaster County. 1940 U.S. Census. Digital Images. http://ancestryclassroom.com.

Rentz Family Records. 1941-1954. Courtesy of Fred Rentz. 

“Rentz, Col. John N.” Lancaster New Era [Lancaster, Pennsylvania], November 8, 1976. 

“Rentz, John N.” The Evening Star [Washington, D.C.], November 7, 1976. 

“With the Service Men.” Daily Intelligencer Journal [Lancaster, Pennsylvania], September 6, 1944.

Secondary Sources

Cornelius, Earle. “70 Years Ago — World War II Came to an End: Local Veterans Tell Their Stories.” Lancaster Online, August 14, 2015. https://lancasteronline.com/news/local/70-years-ago-world-war-ii-came-to-an-end-local-veterans-tell-their-stories/article_52aa533c-41b9-11e5-86cb-430cb9790bed.html.

“Col John Nevin Rentz.” Find a Grave. Accessed December 17, 2025. https://www.findagrave.com/memorial/1113113/john-nevin-rentz.

“Follmer, Clogg & Company Umbrella Factory, Lancaster, Pennsylvania,” Historic-Structures.com. Last modified July 19, 2022. Accessed November 14, 2025. https://www.historic-structures.com/pa/lancaster/umbrella_factory.php. 

“Franklin and Marshall College Historical Timeline.” Franklin and Marshall College. Accessed November 14, 2025. https://www.fandm.edu/college-history/.

“History of Hamilton.” Hamilton Watch Company. Accessed December 7, 2025. https://www.hamiltonwatch.com/en-us/company/hamilton-watches-history?srsltid=AfmBOooXR2BZAQNmMbCBuSBIXLVXR0x4_o6GqkIuEVBu9pxwsJlupQs8.

“Serving the Military for Over 75 Years.” Hamilton Watch Company. Accessed December 7, 2025. https://www.hamiltonwatch.com/en-us/company/military-heritage?srsltid=AfmBOopKk6TqLxGkHd8vjFwQblhhZsYY4KVBtqvitwR1Ih1j8aEF12nZ. 

John Nevin Rentz. Veteran’s Legacy Memorial, National Cemetery Administration. Accessed April 9, 2026. https://www.vlm.cem.va.gov/JOHNNEVINRENTZ/7DF5D17. 

The Journal of Lancaster County’s Historical Society. February 2024. https://www.lancfound.org/wp-content/uploads/LancasterHistory-Journal-ONLINE-VERSION.pdf.

Leckie, Robert. Helmet for my Pillow. Arcadia Press, 2019.

Lockhart, Bill, et al. “Armstrong Cork Co.” Historical Archaeology, 2021. https://secure-sha.org/bottle/pdffiles/ArmstrongCork.pdf. 

“Mary Frances ‘Fran’ Rood Rentz.” Find a Grave. Accessed April 8, 2026. https://www.findagrave.com/memorial/1113113/john-nevin-rentz.

“Our History.” Armstrong World Industries. Accessed December 7, 2025. https://www.armstrong.com/en-us/about-us/our-history.html.

“Our Mission.” Franklin & Marshall College. Accessed November 14, 2025. https://www.fandm.edu/college-history/.

“Pacifist At War.” Moving Image Archive Blog. Indiana University Libraries. June 2, 2015. https://blogs.libraries.indiana.edu/filmarch/2015/06/02/farmer-at-war/.

“RCA/Thomson Lancaster Records, 1942-1997.” Collection Finding Aid. Lancaster History. https://www.lancasterhistory.org/finding-aids/rca-thomson-consumer-electronics-lancaster-plant-records-1942-1997.

“Hamilton Watch: American Heritage with Swiss Precision.” Reis Nichols. Accessed November 15, 2025. https://www.reisnichols.com/blogs/news/hamilton-watch-american-heritage-with-swiss-precision?srsltid=AfmBOoplnCiQGrp0fVx89kRVrtwftEdONaSSeDotDKlQcXCXxMEG5AaE. 

Rentz, Major John N. Bougainville and the Northern Solomons. The Battery Press, Inc.: 1948. 

Rentz, Major John N. Marines in the Central Solomons. U.S. Government Printing Office: 1952. 

Herbert, Justin, and Christopher Rabb. “Revisiting World War II Correspondence of F&M Servicemen.” F&M Stories, January 28, 2025. Franklin & Marshall College. https://www.fandm.edu/stories/world-war-II-correspondence-with-f-m-servicemen.html. 

Sledge, E.B. With the Old Breed. Presidio Press, 2010.

“World War II and the Pennsylvania Homefront.” PA Digital Partnership. Accessed November 14, 2025. https://padigital.org/primary-source-sets/world-war-ii-and-the-pennsylvania-homefront/.

This profile was funded by a grant from the United States Department of Veterans Affairs. The opinions, findings, and conclusions stated herein are those of the author and do not necessarily reflect those of the United States Department of Veterans Affairs.