Final answer:
The two aspects of the application of OPSEC measures are using intelligence services to defeat threats and using counterintelligence services to protect the nation from internal threats.
Step-by-step explanation:
The two aspects of the application of OPSEC measures are:
- Using intelligence services to defeat threats.
- Using counterintelligence services to protect the nation from internal threats.
Intelligence services involve gathering information about potential threats to national security, analyzing it, and taking action to mitigate those threats. Counterintelligence services, on the other hand, focus on identifying and neutralizing internal threats, such as spies or infiltrators who may pose a risk to the nation's security.