In this section, “POW/MIA flag” means the POW/MIA flag of the National League of Families of American Prisoners and Missing in Southeast Asia. This section does not apply to: the State House; or a State building that: is a historic building; or has a flagpole attached to the building; and is determined to be structurally unable to withstand additional flags being flown from the flagpole. The Secretary of General Services and the Secretary of Transportation shall cause the POW/MIA flag to be flown on the grounds of all State buildings under their control whenever the flag of the United States is flown.