Which term describes the response by trained forces to neutralize a threat?

The term that accurately describes the response by trained forces to neutralize a threat is "defeat." This is because the goal of trained forces in a security context is to eliminate or incapacitate an identified threat through various means, whether it be through direct action, tactical maneuvers, or strategic force deployment. Defeating a threat implies taking the necessary actions to ensure the safety of personnel and assets by rendering the threat ineffective.

Other terms, though relevant in specific contexts, do not capture the complete scope of action implied in neutralizing a threat. For example, "delay" refers to slowing down or hindering an adversary's actions without necessarily neutralizing the threat. "Deter" focuses on preventing a threat from occurring through the use of intimidation or the potential for retaliation rather than directly engaging with and neutralizing it. "Detect" pertains to the identification and recognition of a threat, which is a prerequisite for response but doesn't encompass the action taken to neutralize it. Therefore, "defeat" is the term that best describes the comprehensive and decisive response to neutralizing a threat.