AH-64 Apache
Ironic it is that the best weapon of America's premier land force is an aircraft. But given the conflicts the U.S. military has recently fought and is likely to fight, airpower is the most decisive factor.
Equipped with a 30-millimeter cannon, Hellfire missiles, and sophisticated sensors, the Apache combines speed, firepower, and range that allows the Army to strike enemies long before they come within firing distance of Army ground troops. It is equally useful at hunting down insurgents or decimating enemy armored columns. The Apache has fought well in conflicts from Desert Storm to the current Afghan war.