Which of the following agencies provides resources that are useful to Facility Security Officers (FSOs)? (Select ALL that apply)

The Information Security Oversight Office (ISOO) is indeed a vital resource for Facility Security Officers (FSOs). ISOO operates under the National Archives and Records Administration and is primarily responsible for overseeing the government's security classification system. It provides guidance, resources, and policies that help FSOs ensure that their facilities adequately protect classified information as mandated by federal law. The ISOO also issues directives and publications relevant to security practices that are incredibly beneficial for FSOs in maintaining compliance with National Industrial Security Program (NISP) requirements.

While the other agencies listed also have significant roles in national security and may offer support in specific contexts, they are not as directly focused on providing resources specifically tailored to the needs and day-to-day operations within the realm of facility security as ISOO is.