2003

2003 saw the second and third novels, as well as Halo CE released for PC.

Unknown

 * The first line of Halo Action Figures is produced by Joyride Studios.

April

 * April 1:
 * The novel, Halo: The Flood, is released.
 * The first episode of Red vs. Blue machinima series is released.

June

 * June 13: The official version of the Halo 2 E3 Demo is released on Bungie.net.

August

 * August: The tiltrotor squadron VMX-22 was established in the United States Marine Corps. A namesake of the unit would later be a part of the UNSC Marine Corps.

September

 * September 29: The first edition of Halo: Combat Evolved: Sybex Official Strategies & Secrets is released.


 * September 30: Halo: Combat Evolved for the PC is released.

October

 * October 28: A special edition of the Halo: Original Soundtrack is released.

December

 * December 2: The novel, Halo: First Strike is released.