M290 All-Terrain Vehicle

Were you looking for the original M274 Mongoose, featured in Halo 3, Halo: Reach, Halo 4 and Halo 2: Anniversary?

The M290 All-Terrain Vehicle is a UNSC light ground reconnaissance vehicle, introduced in the post-war era as a replacement to the outdated M274 Mongoose. It goes by the colloquial names of 'Mongoose' or 'Mothergoose'. In addition to the standard variant, a variant with twin mounted driver-controlled grenade launchers exists, called the Gungoose