OK. I googled. I got this.
http://www.nmfi.org/natlresp/files/ESF13.pdfESF #13 provides a mechanism for coordinating and
providing Federal-to-Federal support or Federal
support to State and local authorities to include noninvestigative/
non-criminal law enforcement, public
safety, and security capabilities and resources during
potential or actual Incidents of National
Significance.
ESF #13 capabilities support incident management
requirements including force and critical
infrastructure protection, security planning and
technical assistance, technology support, and public
safety in both pre-incident and post-incident
situations. ESF #13 generally is activated in
situations requiring extensive assistance to provide
public safety and security and where State and local
government resources are overwhelmed or are
inadequate, or in pre-incident or post-incident
situations that require protective solutions or
capabilities unique to the Federal Government.
And from the link posted by LAK, it appears that every alphabet agency in America is getting in on the fun in Iowa. Is this a typical case of bureaucracy trying to look useful and spend as much as possible? Perhaps. Is it "tax collection" or "Big Brother" or any other nonsense? No indication so far.