Phoenix Logs/UNSC Buildings/Garage
From Halopedia, the Halo wiki
The Garage and its kit assembly line allows the requisition of Warthog, Scorpion, Wolverine, and Kodiak armored vehicles from the Spirit of Fire and unlocks their upgrade options. This should be one of the first infrastructure upgrades made to a new firebase, as the Garage constructs vehicles that will remain useful throughout the mission. Multiple Garages in a firebase reduces armored vehicle requisition time.
Pelicans and Darters are not rated for transatmospheric transport of most UNSC combat vehicles, due to the potential for damage and loss of control during reentry. While travel to and from the surface of the Ark is dramatically simplified due to its artificial gravity, the Spirit of Fire is not currently configured to make effective use of this deployment method. Instead, UNSC doctrine states that when use of heavy lifters and surface staging areas is not available, combat vehicles can be partially disassembled, "crated" for transport, and then reassembled near the combat zone.