Far into the 26th Century, the UNSC Navy continued to use terrestrial ships to patrol the seas of its worlds. Little is known about this Naval arm, only that bases existed on Earth's Mombasa Quays and the fortress world of Reach. Other than that, it is known that the Navy possessed numerous UNSC Aircraft carriers with a full complement of F-99 Unmanned Combat Aerial Vehicles, suggesting that they were constantly kept at a high-level of alert.
Aside from participating in the Battle of Mombasa to some extent, the wet Navy may have also been involved with an operation in the Yucatán peninsula where the SPARTAN-II Blue Team attacked a Covenant excavation force under the Gulf of Mexico.
Halo: The Final Dawn
Set after the events of Halo 3 this story runs just before the events of Halo 4 and concurrently with to it, and concurrently with Halo:TTW