This dissertation examines the linguistic and cultural difficulties faced by Non-Native English-speaking (NNES) peace officers in the United States, emphasizing English training and job preparedness. The research adopts an explanatory sequential mixed-method design, including quantitative and qualitative data collection and analysis. This study examined the challenges faced by the NNES officers, and emphasizing the importance of language competency and cultural competence for NNES officers. This study conducted an in-depth analysis of current research with specific attention to language difficulties, cultural difficulties, and the training of law enforcement officers. Based on a review of past studies, a theoretical framework was developed for understanding the linguistic and cultural obstacles NNES officers face. Self-administered questionnaires and an organized personal narrative outline was utilized for data collection. The study provides insights into NNES officers' language competency, their experiences with linguistic support, language and culture preparation insights, the role of educational institutions, and ideas for improving stated professional preparation. This study additionally shows an overview of the study's theoretical, practical, and policy implications. The study also examines three convergences and divergences between quantitative and qualitative data to provide a more comprehensive interpretation of the results. NNES police officers' language and cultural preparedness is strengthened by clear and practical recommendations presented at the end of the study. An important contribution of this study is that it illuminates the complex obstacles faced by NNES law enforcement personnel and offers concrete recommendations for improving their cultural and linguistic competence. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]