An enlarged UNSC fleet still needs crews

What if the UNSC had 15 Infinity-class ships, 90 Valiant-class supercruisers, 150 Epoch carriers, 600 Marathons, 800 Halcyon cruisers, and thousands of frigates and destroyers in 2545?

With crews for those ships, the UNSC would overwhelm an invasion and probably suppress its internal rebellions as well.

The proposed fleet supplies enormous numbers of major warships at once. The immediate reservation concerns whether the UNSC has enough people to crew them. If personnel are available alongside the hulls, an invasion of human space is expected to face overwhelming resistance. The same concentration of force would probably crush rebellions within UNSC territory.