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Four, as correctly reported by Knickmeyer, were lost when an explosive device erupted under their Amtrac.

The vehicle, known as an AAV, or “amtrac” for “amphibious tractor,” is used to take Marines and their gear from Navy ships to land.

The vehicle, nicknamed an “amtrac” - short for amphibious tractor - was designed to be buoyant and had three water-tight hatches and two large troop hatches.

The vehicle, nicknamed an “amtrac” — short for amphibious tractor — was designed to be buoyant and had three water-tight hatches and two large troop hatches.

The vehicle, known as an AAV but nicknamed an “amtrac,” for “amphibious tractor,” is used to take Marines and their gear from Navy ships to land.