Notes and writeups on security operations: competition postmortems, homelab documentation, incident response.https://alexchmiel.com/https://alexchmiel.com/writing/neccdc-2026-lessons-learned/https://alexchmiel.com/writing/neccdc-2026-lessons-learned/A first-person NECCDC 2026 blue team postmortem: two days defending Active Directory against a professional red team, what worked, what failed, and what we would do differently.Wed, 27 May 2026 00:00:00 GMTalexchmiel16@gmail.com (Alexander Chmiel)https://alexchmiel.com/writing/firewall-lab-writeup/https://alexchmiel.com/writing/firewall-lab-writeup/The full technical writeup of my firewall management lab: topology, explicit-deny policy, the change-management gate in front of every rule, and a worked incident from alert to closed report.Thu, 21 May 2026 00:00:00 GMTalexchmiel16@gmail.com (Alexander Chmiel)