After the Covenent was defeated, they started working on ProjectS, creating a super vehicle, the Spirit. Capable of taking out all vehicles such as mongooses and warthogs, with ground to air homing missiles that can destroy air combat vehicles with ease. With 4 frontal lasers and homing rocket-launcher, these will pose a large threat to the UNSC!
Tekka Croe's elite
Its humble Gallery
UNSC vehicle coming soon, I hope!
Yes I know, there is already a spirit, oh well