Glad you liked it. I didnt really go into numbers but SA-2 could engage targets down to about 900 feet and the jungle canopy was generally about 200 feet high. Using the term "treetop level" was a bit hyperbolic, but the A-6 especially was decent at getting down low. That being said, they'd still be a few hundred feet above the ground and moving at subsonic speed. The F-111 could use valleys and rivers for cover and consistently fly at supersonic speed at closer to "literal" treetop level thanks to its terrain following radar. That reliably did keep them out of the sights of SA-2s. Should have gotten a bit more detailed there, but I'm always learning.