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That's pretty much up to Bungie. They either didn't have enough time to make it into the game plot, or didn't want to put it in there for reasons unknown.

Following a real-life reason, maybe they were replaced by the Pelican. The Albatross is a heavy-lift craft, and maybe the UNSCDF upgraded the Pelican to have a better lift capability, similar to the US Marine Corps upgrade of the heavy-lift helicopter CH-53 Sea Stallion to the more-capable CH-53E Super Stallion, which effectively replaced the CH-53 and other earlier medium- to heavy-lift helicopters.

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