Dear Mr. Carter,
Thank you for posting your request on History Hub!
We searched National Archives Catalog and located the World War II Operations Reports, 1940-1948 in the Records of the Adjutant General's Office, 1917 - 1985 (Record Group 407) that may include records of the units you are researching. For more information about these non-digitized records, please contact the National Archives at College Park - Textual Reference (RDT2) via email at email@example.com.
We also located the series Unit Histories, 1943 - 1967 in the Records of U.S. Army Operational, Tactical, and Support Organizations (World War II and Thereafter) ( Record Group 338) that includes 3 files related to the 26th infantry regiment in the 1940s, 3 files for the 18th infantry regiment during the 1940s, and 4 files related to the 16th infantry regiment during the 1940s that may be of interest to you. These records have not been digitized. You may contact RDT2 for access to and information about these records.
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Finally, you may also wish to contact the US Army Center of Military History to see if they can offer you any additional assistance.
We hope this information is helpful, and best of luck with your research!
1st Division on DDay http://www.americandday.org/D-Day/1st_Infantry_Division-Order_of_battle.html
Here is some information below. Also might want to check out the Ist Division Museum. https://www.fdmuseum.org/about-the-1st-infantry-division/history-of-the-first-division/
26th INF Regiment:
The 26th Infantry led America’s first-ever amphibious assault in North Africa, fought at the Kasserine Pass, assaulted Sicily, invaded Normandy, conquered the first German city of the war at Aachen, vaulted the Rhine and attacked all the way to Czechoslovakia by war’s end. The 26th Infantry Regiment conducted 3 amphibious assaults, and earned 7 battle streamers, a Presidential Unit Citation, and 5 foreign awards.
Beginning another occupation of Germany, the “Blue Spaders” were given the honor of bearing the United States National Colors at the Allied Victory in Europe parade, and were selected to serve as America’s guard of honor at the Nuremberg War Crimes Trials.
In 1941, the regiment once again stood with its sister regiments and prepared for war in Europe. The regiment was assigned to the 1st Infantry Division for the duration of World War II. In World War II, the 26th Infantry led America's first-ever amphibious assault in North Africa, fought at the Kasserine Pass, assaulted Sicily at the Amphibious Battle of Gela, invaded Normandy at Omaha Beach, conquered the first German city of the war at Aachen, held the line against heavy German attacks at Elsenborn Ridge during the The Battle of the Bulge, vaulted the Rhine and attacked all the way to Czechoslovakia by war's end. The regiment, commanded by Colonel John F. R. Seitz, conducted three amphibious assaults, and earned seven battle streamers, a Presidential Unit Citation, and five foreign awards.
Beginning another occupation of Germany, the Blue Spaders bore the United States national colors at the Allied Victory in Europe parade, and served as guards at Nuremberg War Crimes Trials. Thus began a lengthy stay in Germany, first as conquerors and later as friends and allies. Called again to serve in the United States after a reorganization of the army, the unit was redesigned 1st Battalion, 26th Infantry and had a very short stay in the United States
18th INF Regiment:
- North African campaign. On 8 November 1942, the 18th Infantry Regiment (part of the 1st Infantry Division) went ashore at Oran, Algeria. Ensuring that the 18th was one of the first U.S. Army infantry units to engage in combat against Axis forces. The regiment (or elements of the regiment) would experience heavy action over the following seven months at Maktar, Tebourba, Medjez el Bab, the Battle of Kasserine Pass (where American forces were pushed back), and Gafsa. It also participated at El Guettar, Béja, and Mateur. The 18th Infantry Regiment was in combat in the Tunisian Campaign from 21 January 1943 to 9 May 1943, helping secure Tunisia for the Allies.
- Invasion of Sicily. The regiment participated in The Battle of Gela (10 - 12 May 1943) where it withstood heavy counterattacks from Italian and German forces. On 7 August 1943, the 18th Infantry Regiment captured Mount Pellegrino which overlooked the Troina defenses allowing accurate direction of Allied artillery.
- Invasion of Normandy. The 18th Infantry Regiment was part of the landing forces that participated in the initial onset of Operation Overlord. The 18th Regimental Combat Team (RCT) was part of the 1st Infantry Division forces that stormed Omaha Beach. The regiment was scheduled to land at 09:30 on Easy Red. The first battalion to land, 2/18, arrived at the E-1 draw 30 minutes late after a difficult passage through the congestion off shore. Casualties were light, though despite the existence of a narrow channel through the beach obstacles the ramps and mines there accounted for the loss 22 LCVP's, 2 LCI(L)'s and 4 LCT's. Supported by tank and subsequent naval fire, the newly arrived troops took the surrender of the last strong point defending the entrance to the E-1 draw at 11:30. Although a usable exit was finally opened, congestion prevented an early exploitation inland. The three battalions of the 115th RCT, scheduled to land from 10:30 on Dog Red and Easy Green came in together and on top of the 18th RCT landings at Easy Red. The confusion prevented the remaining two battalions of the 18th RCT from landing until 13:00 and delayed the move off the beach of all but 2/18, which had exited the beach further east before noon, until 14:00. Even then, this movement was hampered by mines and enemy positions still in action further up the draw.
- Northwest Europe The 18th Infantry Regiment would experience almost eleven months of continual combat operations from the allied invasion of Normandy (June 6, 1944) to the end of World War II in Europe in May 1945. Among the many actions that the regiment participated in were Battle of Aachen, Battle of Hürtgen Forest, The Battle of the Bulge and crossing at the Remagen bridgehead 15 - 16 March, 1945
16th INF Regiment:
16th INF Historical Society https://www.16thinfantry.com/