In 2018, the Army started announcing spending $572 million to train our soldiers because our next wars will be in mega-cities not inside them but beneath them.

Beneath = Subterranean Warfare.

President Trump is the 1st President to establish a Strategic Plan for Subterranean Warfare. 

In May 2019, an Army Publication written by Officer and released from War College stated that the Army was spending $572 million for Subterranean Warfare.