Among the many prototypes that Project EXCALIBUR produced, the majority were not adopted for one reason or another. The M13-X Lynx Light Reconnaissance Vehicle was shelved for budgetary reasons, while the development of the XAD82-CAS Petrel Gunship was flawed from the beginning. One design which had perhaps the greatest chance of success was the M77A-X Jaguar APC, developed for theatres of combat where the common but exposed M12 Warthog LRV variants were utterly ineffective. It also pioneered the use of the "Ancile" armour system, developed to be effective against plasma weaponry. Though it had begun limited production, the entire line was destroyed during the Battle of Reach, and the last two were destroyed during the First Battle of New Mombasa.