Vortex, like Leupold, offers an extremely broad product line.
The Vortex Razor line is made in Japan and has a stellar record in both combat and competition.
The made in USA Vortex AMG is another outstanding product.
The original PST line seemed to have some issues.
Who exactly is using Vortex in combat? I believe the correct answer is......nobody. Certainly not any US troops. Being made in Japan would preclude them from that.