DARPA Captive Air Amphibious Transporter

A Captive Air Amphibious Transporter (CAAT) is a 1:5 scale tracked amphibious vehicle prototype being developed by DARPA. It drives on the water with air-filled pontoons attached to the tracks, and is intended to demonstrate how to transport standard 20- or 40-foot containers from ordinary container ships to shore without using a harbor. DARPA is investigating its usefulness in disasters so that commercial shipping can relieve military ships to focus on military tasks. The CAAT is one of four elements in the Tactically Expandable Maritime Platform (TEMP) program; the others being a containerized living quarter, a stabilized crane, and an unmanned powered parachute delivering containers by air.

Source
This article incorporates work from https://www.fbo.gov/index?s=opportunity&mode=form&id=84b2ca1784dda86b61f606897097e3cc&tab=core&_cview=0, which is in the public domain as it is a work of the United States Army.