The UNSC Navy was created in the wake of the Interplanetary War of the 2160's - precisely during the Argyre Planitia Campaign of 2163, as a result of the UN need to oversee and monitor Marine deployments from space, thus forming the UNSC. The UNSC Navy is a direct descendant of the UN Navy. It is led by the UNSC Naval Command.
UNSC Anchor 9 above Reach.

The UNSC has a large fleet of warships, including many capital ships and single-ship craft. The UNSC Navy sustained heavy losses of materiƩl and personnel throughout the war against the Covenant. Many valuable assets of the UNSC Navy were destroyed during the Fall of Reach, and a very large portion of its remaining ships were lost when the Prophet of Truth occupied Earth. At least some UNSC ship production is handled by the Reyes-McLees Shipyards, though this may no longer be true due to the Covenant invasion of the Sol System.

UNSC Navy personnel are given training in self-defense. All crewmen are trained to use the M6 series of handguns.