Short Answer 
DOD employees, like Robb, must report attempts to compromise national security personnel, interactions with foreign contacts that may involve espionage, and any unauthorized disclosures of classified information to safeguard national interests and maintain the integrity of sensitive data.
Step 1: Mandatory Reporting of Compromise Attempts
Robb, as a DOD employee, must report any efforts to compromise individuals with national security eligibility. This is crucial because such breaches can pose a significant threat to the overall national security. Being vigilant in this area helps maintain the integrity and safety of sensitive positions.
Step 2: Reporting Foreign Contacts
It is essential for DOD employees to report any foreign contacts they may have. This includes any interactions that could potentially involve espionage or related threats to national security. By doing so, employees can help safeguard classified information and prevent unauthorized access to sensitive data.
Step 3: Disclosure of Classified Information
Any unauthorized disclosure of classified information must be reported immediately. Such disclosures can severely jeopardize national security and put numerous individuals at risk. DOD employees should act swiftly to ensure that any breaches are addressed to protect national interests and maintain confidentiality.