Why is DHS buying 2,700 mine-resistance vehicles?

WHAT MAJOR EVENT IS PROMPTING DHS TO PURCHASE 2,700 MINE-RESISTANCE VEHICLES? 

WE DON'T HAVE MINE-FIELDS IN THE UNITED STATES.  SO WHAT THE EVENT?  ARE THE FEDS PLANNING SOMETHING ON A GRAND SCALE.  I REMEMBER OBAMA SAYING SOMETHING A FEW YEARS BACK THAT HE WOULD LIKE TO HAVE A CIVILIAN FORCE EQUAL IN STRENGTH TO THE U.S. MILITARY---IS THIS THE BEGINNING OF A NATIONAL POLICE FORCE CONTROLLED BY THE WHITE HOUSE?
STOP OBAMA! Stop Obama's Second Term Agenda WIDGET. FOLLOW LINK FOR DETAILS.