What is one current SCI control system alongside HCS and SI?

The designated correct answer is TALENT KEYHOLE, which is indeed one of the current Sensitive Compartmented Information (SCI) control systems. TALENT KEYHOLE refers to a category of intelligence that emphasizes imagery intelligence (IMINT) acquired from high-resolution satellite and aerial surveillance systems. This collection system enables the U.S. intelligence community to gather critical information on various global activities for national security and military operations.

The other options, while related to different aspects of security or intelligence, do not fit the specific category of current SCI control systems aligned with HCS (HUMINT Control System) and SI (Signals Intelligence). Operational Security involves practices to protect sensitive activities and information but is more about maintaining security than being a specific control system. Cyber Intelligence relates to the analysis of threats to information systems and networks, which falls under a different discipline of cybersecurity rather than an SCI control system. Lastly, Human Resources Security deals with the measures and practices to secure personnel dealing with sensitive information, rather than a specific control system like TALENT KEYHOLE.