These government sites keep popping up out of the blue. Never heard of this one but it certainly does muddle the waters between 'cyber' and physical security.
There is no muddle here. Physical security has always been an essential component of information security, even as the PR-driven naming convention migrated through information assurance to cybersecurity. there can be no security of your information without addressing physical security. In the original 10 domain CISSP CBK one of the domains was physical security. Physical security remains enclosed into at least two of the current eight CBK domains.
As a profession we screwed up by letting cyber become magic word with the result auth folks think infosec under the cyber name is only about electronic digits. I do not blame (ISC)2 for this mess, I blame the US Defense department, for changing the magic name in key infosec directives and related publications.