Kammala jumla mai zuwa: Rukunin na 3, a karkashin jagorancin Manjo Janar Jonathan W. Anderson, bayan da ya shafe watanni da yawa yana horarwa a Amurka bayan harin Japan a kan Pearl Harbor, ya fara aiki a lokacin yakin a matsayin wani ɓangare na Ƙungiyar Task Force a Operation Torch, Allied
mamaye Arewacin Afirka, sauka a Fedala a ranar 8 ga Nuwamba, 1942, kuma ya kama rabin Faransa Morocco. Rukunin ya kasance a can na 'yan watanni masu zuwa kuma saboda haka bai shiga cikin Kamfen na Tunisiya ba, wanda ya ƙare a watan Mayu 1943 tare da mika wuya kusan sojoji 250,000 na Axis waɗanda daga baya suka zama fursunonin yaƙi (POWs). Duk da yake akwai rundunar bindiga ta 30 ta yi aiki a matsayin masu tsaron tsaro a lokacin taron Casablanca a tsakiyar watan Janairun 1943. A ƙarshen Fabrairu Manjo Janar Anderson ya bar rukunin kuma Manjo Janar Lucian K. Truscott, Jr. ya maye gurbinsa, wanda ya kafa tsarin horo mai tsauri kuma ya tabbatar da cewa dukkan darajoji a cikin rukunin za su iya tafiya mil biyar a cikin awa ɗaya, kuma mil huɗu a cikin awa ɗaya daga baya. Sojojin sun kira shi "Truscott Trot". Ƙungiyar ta fara horar da horo a cikin ayyukan amphibious.