This is the official logo of 343 Industries.
™/®Microsoft Corporation
Vectorised by <a href="//commons.wikimedia.org/wiki/User:Vulphere" class="mw-redirect" title="User:Vulphere">Vulphere</a> based from <a rel="nofollow" class="external free" href="http://download.microsoft.com/download/A/2/E/A2EE1321-9CB0-434D-9B2A-05B09938451D/HaloCE_US-EN_MNL.pdf">http://download.microsoft.com/download/A/2/E/A2EE1321-9CB0-434D-9B2A-05B09938451D/HaloCE_US-EN_MNL.pdf</a>