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There aren't really anymore advances in stealth and armor. If anything anti-stealth and anti-armor tech is advancing much more rapidly.

What is advancing is area denial, anti-drone tech, and active protection systems.

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Stealth will always be important - it's just a numbers game to try and optimize RCS vs an opponent's radar systems. The big thing going forward will be creating resilient networks of shooters/sensors. This is where drones will make their money - spotting stuff via camera or radar for other manned planes, SAMs, or artillery.

It's not, actually. Minimizing RCS hits a hard, unavoidable wall once the wavelength of the radar is close to that of the object. So it's a matter of getting large wavelength radars that are accurate enough.

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