As a former USAF special operations helicopter pilot, I can attest that threat rings are a thing.

Flying low-level at night, into a high-threat area, demands discerning areas where you can flying under a radar's 'line of sight' based on terrain obstacles in front of the radar's coverage.

Today, this work is done automatically and streamed into the cockpit for real-time air defense threat awareness for aircrews, based on aircraft altitude and IADS unit placement.

Adversaries to Israeli military elements will now have a much harder time evading detection in the Levant due to a new Israeli radar installation being set up on newly-captured Mount Hermon in Syria.

Mount Hermon is the highest point in the region and will provide low-level radar coverage far and wide.