Former active U.S. general says new warfare coming;

Tells West Point grad class to get ready;

World to be more unstable; Significant conflict emerging;

Grads to bear responsibility to make sure we are ready;

U.S. is no longer unchallenged World power;

U.S. cannot cling to weapons of past:

Warfare changing in next 25 years;

Artillery is prevalent in Ukraine; Soon more drones;

Will also be relying on robotic tanks, ships & airplanes;

Also on Synthetic fuels, 3D Manufacturing, & human engineering;