Defense in Depth, Medieval Style

This article on the walls of Constantinople is fascinating.

The system comprised four defensive lines arranged in formidable layers:

  • The brick-lined ditch, divided by bulkheads and often flooded, 15­-20 meters wide and up to 7 meters deep.
  • A low breastwork, about 2 meters high, enabling defenders to fire freely from behind.
  • The outer wall, 8 meters tall and 2.8 meters thick, with 82 projecting towers.
  • The main wall—a towering 12 meters high and 5 meters thick—with 96 massive towers offset from those of the outer wall for maximum coverage.

April 15, 2026
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Anthropic and the Pentagon

OpenAI is in and Anthropic is out as a supplier of AI technology for the US defense department. This news caps a week of bluster by the highest officials in the US government towards some of the wealthiest titans of the big tech industry, and the overhanging specter of the existential risks posed by a new technology powerful enough that the Pentagon claims it is essential to national security. At issue is Anthropic’s insistence that the US Department of Defense (DoD) could not use its models to facilitate “mass surveillance” or “fully autonomous weapons,” provisions the defense secretary Pete Hegseth …

March 6, 2026
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Building U.S. Drone Dominance Brick by Brick

OPINION — One of the things I loved about LEGO as a child was the ability to mix and match an endless amount of parts to create unique builds. Children (and some adults) gather around a bin of parts to create something new. Imagine being asked: “Build…

January 5, 2026
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The Brave New World of Drone Swarms

DEEP DIVE – A drone weapon heads behind enemy lines, on a mission to kill troops and destroy equipment. To its left and right are a dozen other armed drones, and as the mission unfolds they compare notes – on enemy positions, the success or failure of…

November 10, 2025
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The Brave New World of Drone Swarms

DEEP DIVE – A drone weapon heads behind enemy lines, on a mission to kill troops and destroy equipment. To its left and right are a dozen other armed drones, and as the mission unfolds they compare notes – on enemy positions, the success or failure of…

November 10, 2025
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