Unidentified UNSC ship (dorsal pods)
From Halopedia, the Halo wiki
This unidentified vessel is a ship of unknown type used by the UNSC Navy. The class was in service by 2517, when at least one held station near one of Reach's orbital defense platforms. It can be distinguished by two pairs of cap-like protrusions on either side of the dorsal surface.
This ship, introduced in 2010's Halo: Fall of Reach - Boot Camp, was based on a design for a UNSC shield generator ship that was cut from Halo 2. The UNSC did not possess energy shielding technology at the time the ship is depicted in Boot Camp so its canonical role is unclear.
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