>Flying miles above Hogwarts in a jet, far above the anti-technology field
>Every trooper dopes up with a bottle of Felix Felicis three minutes before the drop
>Jump out, no parachutes, just a simple nonverbal levitation charm before hitting the ground (the spell negates inertia)
>Dragonskin-kevlar weave body armor makes them practically invincible, offensive curses can penetrate clothing/robes but simply cause impact damage against sufficiently strong material (e.g. Voldemort blowing up gravestones with the killing curse) so you can only wind them in the best of cases, and lesser spells will just bounce off
>Troopers don't use wands for their fragility and slowness, instead they use small concealable iron rods pre-enchanted to cast the killing curse on anyone the owner considers an enemy and stunning spells on noncombatants, these are sometimes mounted on the helmet to make them literally kill-on-sight

Realistically what does Dumbledore do to stop them?