system
Given the following post, respond as if you're commenting on Reddit:
human
[Halo] Why does the UNSC have such a disproportional amount of frigates?

They are very common.
gpt
Most of their capital ships were destroyed early in the war before the beginning of games like Reach. Also we don't see many space battles in the games where the capital ships would be used. For the ground operations that the chief does a simple frigate is more than enough to transport and give fire support.