Diesel electric tractors, called mules after the original
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Summary
Diesel electric tractors, called mules after the original method of towing, guide the amphibious transport dock ship Pre-Commissioning Unit San Diego (LPD 22) as the ship enters Gatun locks, the first in a series of three, during their transit through the Panama Canal. San Diego, the sixth ship in the San Antonio amphibious class, is on her maiden voyage en route to her future homeport and namesake city following construction at Huntington Ingalls Shipyard in Pascagoula, Miss. San Diego will be commissioned in San Diego in May 2012.
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