From Halopedia, the Halo wiki
Post-Covenant War conflicts
Gao Space Navy
A Basilisk is a forward command-and-control craft in service with the Gao Ministry of War's Space Navy. The crafts are capable of holding high altitudes of at least five hundred meters. Independence is a Basilisk craft commanded by Minister of War Gaspar Baez.
The crafts are likely named after the legendary reptile of the same name, reputed to be king of serpents.