Who is responsible for managing, training, and directing the command's security forces?

The correct choice is the security officer, as this role is specifically designated for managing, training, and directing the security forces within a command. The security officer's primary responsibilities include ensuring that the command's security operations are effectively carried out, maintaining the readiness and training of security personnel, and developing security protocols to safeguard personnel and assets.

The security officer also works to assess any potential threats and responds with appropriate measures, coordinating with various other departments to ensure comprehensive security management. This position is integral to maintaining a secure environment, emphasizing the importance of specialized training and oversight in security operations.

In contrast, while the commanding officer has overall responsibility for the entire command, their focus is broader and encompasses strategic leadership rather than specializing in security forces. The operations officer is typically concerned with the execution of operational plans and tasks, while the intelligence officer primarily deals with gathering and analyzing information related to threats rather than managing the security team directly.