The F-371 Halberd is an atmosphere and exoatmosphere capable, four engine, twin-seat, carrier-capable air/space superiority fighter used by the UNSC Navy.
The 'Halberd' is actually an early concept art of the YSS-1000 Sabre from Halo Reach. Image slightly edited by me, copyright held by Microsoft.
Once again, I did not create this image, or do anything except cut it out/make the background transparent.
If you want to see stuff actually created by me, check out the rest of my gallery