Abstract.The effective Command, Control, Communications, Computers, Intel-ligence, Surveillance, and Reconnaissance (C4ISR) systems are crucial for modernmilitary operations providing clear situational awareness and vital elements for This article proposes to explore the potential of Large Language Models(LLMs) to enhance the current C4ISR capacities such as analyzing vast amountsof data, translating languages, and generating diverse creative text formats thatmake them useful for heterogeneous data and information fusion, threats andfakes detection and analysis and decision support. After the introduction, the lit-erature review discusses the technical considerations and potential benefits fromthe integration of LLMs into C4ISR systems. This discussion includes the func-tionalities such as multisource and multimodal data integration, detection, analysis The main challenges related to the use of today’s LLMs to enhance C4ISRframework such as data security, model interpretability, and bias mitigation willbe studied during this research. The specific challenges will be derived from the Keywords:Global security·cognitive artificial intelligence·LLMs·C4ISR·military decision support systems·data fusion·intelligence analysis· 1Introduction 1.1AI in Military C4ISR Systems C4ISR (Command, Control, Communications, Computers, Intelligence, Surveillance,and Reconnaissance) is an integrated framework used by armed forces, intelligence agen- 2D. Verdejo and E. M. Laurent and ensure strategic advantage. It integrates multiple capabilities to enhance situationalawareness, decision-making, and operational effectiveness. Among the applications ofC4ISR are also detection of cyber treats, various fakes including propaganda, maintainingof boarder security and management of emergency and crisis situations. C4ISR networks Various AI techniques have been employed to support the key components of C4ISR,with some of these techniques recently being renamed. Notably, Reinforcement Learningand Cognitive AI (also known as Knowledge-based AI or Symbolic AI) have been suc- cessfully used to enhance multi-agent system-based simulations, enabling them to maketactical decisions in dynamic environments (Möbius et al.,2023). Cognitive Artificial Intelligence within the C4ISR framework emulates human-like reasoning and decision-making by processing complex information and providing actionable insights (Sumari et al.,2017). Additionally, cognitive systems are applied in Electronic Warfare (EW)to enhance situational awareness and decision-making by interpreting large datasets to identify patterns and anticipate adversary courses of action (COA) (Barbu,2024).Machine Learning algorithms are extensively used in military intelligence to analyzevast amounts of data from various sources, including SIGINT (Signal Intelligence) and Deep Learning (DL) techniques, such as Convolutional Neural Networks (CNNs)have been used for image recognition, classification, and processing in military appli-cations. The related models are optimized to run on tactical mobile edge devices with Natural Language Processing (NLP) helps improve communication between humansand AI systems in military applications. This includes the issuance of doctrines andobjectives in natural language, enabling AI agents to understand and execute complexcommands (Möbius et al.,2023). The chat bots and conversational AI systems, suchas Copilot and Gemini, have been tested for decision support in military command andcontrol processes, demonstrating their potential for providing accurate and complete 1.2Challenges and Research Proposal There are still some key challenges to address for better efficiency and accuracy of •Intelligent integration of various data sources with consistency verification and“garbage collector” for data,•Prediction and early detection of cybersecurity threats that can compromise sensitive How Can LLM Improve Efficiency of C4ISR? •Adequate human-AI interaction for effective Decision Support Systems. Such challenges require innovative solutions to improve the whole life cycle of datacollection, management and processing, user-AI interaction, even synergy and streamlinecommunication across various platforms. The aspects such as speed, accuracy, scalability To address the above challenges we propose to explore the potential of Large Lan-guage Models (LLMs). They are able to analyze a huge amount of data, identify patterns,and generate relevant insights, thereby streamlining operations and improving situational awareness. Their integration capabilities have been studied in various contexts, both froma generic software component perspective (Weber,2024) and as a specific category oftools for military applications, where rapid decision-making is essential in dynamic LLMs, such as GPT-4, have demonstrated their capabilities in natural language “un-derstanding”, generation, translation, and “reasoning”. Integrating LLMs into C4ISRsystems may enhance their e