The Blackhawk can carry Hellfires, but very, very rarely ever does. Also, if it did, it would most likely be in the Special Ops configuration as an MH-60L DAP. The big Army does not use Blackhawks as gunships.
Check out my replies further up to see the differances between a standard UH-60L and the MH-60L DAP. Also, in the DAP configuration, you are correct that the rear troop seats would not be installed.
As a standard UH-60A troop transport, the rar troop seats and M60 MGs in the gunners' positions would be installed, but the ESSS (External Stores Support System) wings would not be installed. They are rarely used as well. Usually, they are only used on MedEvac Hawks with external fuel tanks for extra range.
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