After hearing the many reports of pelicans crashing and getting shot down, the UNSC employed a new fighter to fulfill the role of escort.
This fighter was cheaper and smaller than the Longsword fighter bomber, and took some of the work load off the over-worked Longswords and allowed them to focus more on bombing.
A thrust vectoring engine provides the Wasp with excellent maneuverability in vacuum as well as atmosphere.
Designed and armed to be an escort, the Wasp is also capable of performing quick attacks on enemy targets, unleashing salvos of missiles and machine gun fire.
The three flaps act as thrust vectoring, like the F-22.
Bottom with the bomb bay closed
and another pic with the bomb bay open, with a fully load out on the rotating missile racks.
Quoting LegoTrooper 101
Man, I love the MOC, but I hate hearing about Halo!! I love the game. But I dont have it. I always feel left out when someone starts talking about it(even thought I made 75 kills on my buddy:P)
Suffice it to say, transports get shot down...alot. So they need an escort which is where this comes in. :-)