My neighbor Tom is fifty-eight years old.His house has central air conditioning, a seventy-inch television, and a leather recliner that probably cost more than my first car.Yet every day at 5:15 PM, Tom walks out of his house.He opens his garage door, unfolds a cheap green canvas lawn chair on his concrete driveway, and sits down with a can of beer.He does not look at his phone.He does not read a book.He simply stares at the asphalt and the trees across the street.I watched this for three weeks from my kitchen window.In my homeland, a warrior does not abandon the comfort of the inner fortress unless he is standing watch at the gate.I realized the truth: Tom had taken the evening garrison duty. He was guarding the perimeter of our street against unknown incursions.A samurai does not let an ally hold the line alone.On Thursday at 5:15 PM, I took a metal folding chair from my kitchen.I marched out to my driveway, set the chair six feet from the road, sat down with my spine completely rigid, and placed my hands flat on my knees.I stared straight ahead into the empty cul-de-sac.Tom looked over from his driveway thirty yards away.He blinked once. Then he raised his beer can two inches in solemn acknowledgment.I gave him a disciplined nod.The western sector was secured.At 5:22, a woman walking a golden retriever passed by."Evening, Tom! Hi there!" she waved.Tom lifted two fingers from his can. "Hey, Brenda."At 5:35, a delivery van slowed down, confused by house numbers.Tom pointed his beer can toward number 18. The driver waved and turned right.At 5:48, an old man down the street was struggling to pull a heavy trash bin up his slope.Tom set his can down, walked over in his sandals, hauled the bin to the top, said three words, and walked back to his chair.I sat there on my hard metal chair, sweating in the summer heat, watching the street breathe.I understood now.A man does not sit in his driveway because he lacks a couch.A closed front door says: "This house belongs to me."An open garage with a lawn chair says: "I am out here if you need a hand."It is the oldest neighborhood defense system on earth. It requires no walls, no passwords, and no weapons. Just a working man and eight dollars of canvas.At 6:00 PM, Tom stood up and folded his chair.He looked at me, gave a short two-finger salute, and said, "Good shift, buddy.""The border was peaceful, Tom-dono," I replied.He laughed and went inside for dinner.My lower back was completely destroyed from the metal chair.My street had never felt safer.