Building A Futile Wall, Or not

I WAS BUT A WEE LAD of sixteen when the George C. Scott movie "Patton" came out in 1971. I loved it then, i'd love it now. Patton, street smart in his crude sort of way, was convincingly portrayed by Scott. His famous injunction against fixed fortifications being monuments to mankind's stupidity seems more apropos now than ever. Patton understand that the invention of the tank and the airplane rendered fortified structures obsolete in modern warfare, and he would understand today that there is no use in constructing the "Great Wall of Mexico". An eighteen foot wall required only a nineteen foot ladder to be overcome, more or less. Why is it that those who support the wall concept don't accept that stark fact? A wall is a mere inconvenience, a temporary impediment to further progress, a means of keeping those inside and outside who have no desire to cross ot the other side. A wall is like a locked door; it serves only to keep honest people honest. The criminals will come anyway. Border security, true border security, requires the presence of a massive military presence. lest we forget in our zeal to right all the wrongs of the world with global military deployments, the first and fundamental purpose of a military is self defense, the defense of a sovereign state's borders. A massive military presence need not be unfriendly to those who seek to enter a country, those who seek access to asylum. A strong military presence can serve as a welcoming as well as a protective force. It is questionable whether a strong military border defense on the Rio Grande would violate the 1877 Posse Comitatus law. since the military presence would be serving a national defense requirement and not enforcing civil laws in the form of a police force, it would seen not. All over the world are American military installations intended to enforce an american geo-political agenda. a valid question is whether an American agenda is in the best interests of anyone other than the American corporate state. It very well might not be. From hundreds of widely disperse military bases of questionable intend and necessity, surely the U.S. could find sufficient manpower to man and safeguard its own borders. What, other than that, is the legitimate purpose of any military?