Here's my question: Do you think that your nation's military forces need a special branch for underground warfare? Why or why not?
There is the Airforce for air dominance, the Army for securing and land, and finally the Navy for conquering the seas. However, shouldn't there also be a branch of your military that specializes in Underground(or Subterranean) warfare?(To Waffer military members, correct me if there is such a unit)
I can name many reasons why the undergrounds should be fully used; one of them is that historically, guerrilla forces such as the Vietcong owed much of their victory to the underground's ability to stealthily and efficiently transport massive amounts of men and resources through tunnel warfare. Another is that even guerrilla fighters today (Hezbollah,Taliban) are going underground, and are sometimes very successful in countering their technologically superior opponents while being resourceful.
Finally, I'm aware that many military forces today have special underground units such as combat engineers to build tunnel and bunkers while destroying those of the enemy. However, in the future, shouldn't they evolve into elite subterranean armies that have the greatest virtues of guerrilla armies(highly priced capabilities such as stealth and mobility without the high price), yet still keeping their firepower and tech advantages over guerrilla armies?
Only picture that I think is relevant:

