My father was in the Sea Bee's in the South Pacific during WWII. At the end of the war he would back a Cat into a landing craft. The would fill the landing craft with trucks, jeeps, compressors, construction equipment, airplanes and everything else you could think of. Then they would go out to sea, open the front and push everything into the ocean. He would jump off the running Cat and it would follow the equipment into the drink.