The involvement of commercial entities in the militarization of artificial intelligence(AI)is an important and special phenomenon.These new actors do not only fully participate in the entire process of research development,applica-tion,and deployment in military AI,but also play a significant role in enhancing defense capabilities and strategic deployment of countries,affecting the overall direction of the militarization process of AI in a state.Case studies from the Unit-ed States,Russia,Israel,and France.show that the different roles of commercial entities in the military structure and process have shaped each state's AI militari-zation pace differently,and have impacted the innovation in national defense military capabilities and deployment strategies.States need to adjust their rela-tionships with commercial entities according to their actual circumstances,com-plementing the shortcomings of the traditional defense industry system and stim-ulating the-vitality of the military system,while guiding a harmonious interaction between commercial strategies and national security strategies,so as to jointly contributer to a responsible applications of military AI.