A couple that would be somewhat interesting to many may be the exploits of some Separate Infantry Battalions or Regiments assigned to the U.S. Army such as the 99th "Viking or Norwegian" Infantry Battalion, Separate.
The 99th was an independent infantry battalion made up of Norwegian speaking Americans mostly from Minnesota, Western Wisconsin and eastern North Dakota originally designed to operate in Norway. As is quoted, "Its unit roster read more like a phone book of Oslo than an American Army unit". Formed & activated at Camp Ripley, MN, it would train with the 10th Mtn Div and the "Greek" Battalion in Colorado as well. It arrived on the mainland of Europe on 22 Jun 44 and was assigned to the 1st Army as an Independent Bn but often times attached to the 2nd "Hell On Wheels" AD getting experience near Cherbourg and across central France and finally into the Aachen area. Its first real big engagement was at Wurselen, GE attached to the 30th ID where it engaged in almost hand to hand fighting when it was tasked with holding the salient that jutted to meet the 1st ID in the encirclement of Aachen. Later it would be moved to the Stavelot-Malmedy area where operating often times completely surrounded it helped isolate KG Peiper and along with the Independent "Belgian" Battalion would deny the Germans access to the fuel dumps in the area and conduct in successful counter-attacks to deny the 1st SS Pz Div any further advances in that sector. It remained on the northern shoulder of "The Bulge" operating with the 517th PIR (Ind) as well as the 5th Belgian Fusilier Battalion (Ind) and some remaining elements of the 1st SSF until 22 Jan 45. Ironically, one of the American units that broke through an encirclement to the surrounded Bn while in Malmedy, actually arrested a few members as German spies because their accents were so heavy they thought they were German soldiers posing as Americans. Eventually absorbed into the 474th Ind Inf Rgt along remaining elements of the 1st SSF and some independent para and ranger units, it would fight its way across Germany in April and May of 45, liberating the art treasures the Nazi's had ensconced in salt mines and busting through many a 60 minute roadblock along the way. (NOTE: The German civilian populace referred to the temporary roadblocks thrown up by the retreating German Army as 60-min. roadblocks because the Americans would roll up on on it, laugh for 59 minutes, spend a minute tearing it down and continue on their way undeterred but mildly amused.)