Flat tires and slow escape times plague Marine ACV initial operational test Marines take the Amphibious Combat Vehicle 1.1 out for a ride aboard Camp Pendleton, California. (Marine Corps ) The reviews are in for the Marine Corps’ newest amphibious vehicle and they are not good. While the amphibious combat vehicle outperformed the Vietnam-era amphibious assault vehicle it is slated to replace, “across all mission profiles” uncomfortable seats, a significantly higher failure rate than required, and limited interior space that would slow down emergency escapes left a lot to be desired. The reviews were published in a report from the Defense Department’s operational testing and evaluation office, first reported by Task and Purpose.