From the back cover:
The Vehicle Compendium series showcases the most common pieces of vehicular equipment used by the armed forces of Terra Nova in the 62nd century. This second volume contains the tanks and artillery pieces originally found in the Field Guide S2 and the Tactical Field Support, along with a detailed recognition chart and ready-to-play record sheets. In all, this second volume includes:
Caiman and its variants (Crocodile, Support Crocodile, and Alligator)
Elan (and its Evil Eye variant)
Hun (plus the Ballista, the Hittite, the Ostrogoth, the Celt, and the Recon Hun)
Visigoth (including the Vandal, the Blitz Visigoth and the Visigoth KHAN)
Barnaby (and the Mother Barnaby)
Artemis (and its variant, the Laser Artemis)
Nightingale (plus the NBC Nightingale)
Jackrabbit (with one of its variants, the Jackrabbit B)
Field Artillery gun