system
Given the following post, respond as if you're commenting on Reddit:
human
[Halo] Why haven't the UNSC reverse engineered covenant antigrav tech? They must have a whole mountain of ghosts and wraiths that they can use by now?
gpt
They dont really need to. UNSC ground technology was already almost on par with the Covenant early in the war, even discounting the advantage of their plasma weapons, they were holding their own on the ground. Most of the UNSC ground vehicles wouldnt benefit that much from anti grav tech anyway, the warthog is pretty cheap to produce, and the Scorpions are incredibly maneuverable anyway.

TL:DR Its probably a cost-benefit thing as UNSC ground tech is perfectly fine as it is.