The AH-64 Apache is the Army's heavy division/corps attack helicopter. The AH-64D Longbow remanufacture effort incorporates a millimeter wave fire control radar, radar frequency interferometer ...

The AH-64 Apache attack helicopter The Boeing AH-64 ... Japan (which is retiring the fleet), Israel, the Netherlands, ...

And the US Army AH-64 Apache and Russian Ka-52 Alligator are generally considered to be the two best military attack helicopters in the world (with the Russian Mi-28N arguably in a close third).