system
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human
[Halo] How does the covenant retrieve scarabs after they’ve been dropped into battle?

For example, after the Fall of Reach, there were likely dozens of scarabs left operational, how would the covenant go about getting them back into their ships. 
The only way a scarab is seen entering a battle (at least in the games) is dropping from orbit, and I don’t think that carriers can get that close to the ground. My best bet would be either an enormous gravity lift or a special barge to carry them into a ship.
Is there any definitive answer in the lore, or a line of dialogue in the games that gives an answer?
gpt
The corvettes can go into orbit, when you destroy the spire in reach for example.

As for how they retrieve them, it’s possible it’s a giant gravity well, or they can be air lifted by several phantoms, they can lift tanks no problem.