Marines give civilian media a ride in the inside the Amphibious Assault Vehicle Survivability Upgrade at Marine Corps Base Quantico, Va., March 15, 2016. The AAV SU, or amphibious assault vehicle survivability upgrade, will build upon the existing hull. The upgrades include additional armor, blast-mitigating seats and spall liners. They may also include fuel tank protection and automotive and suspension upgrades to keep both land and sea mobility regardless of the added weight. - Marines give civilian media a ride in the inside the Amphibious Assault Vehicle Survivability Upgrade at Marine Corps Base Quantico, Va., March 15, 2016. The AAV SU, or amphibious assault vehicle survivability upgrade, will build upon the existing hull. The upgrades include additional armor, blast-mitigating seats and spall liners. They may also include fuel tank protection and automotive and suspension upgrades to keep both land and sea mobility regardless of the added weight.