Besides software and remote maintenance access issues, from the fine article: "The Chinese [ZPMC cranes] can track the origin, destination and other data of the U.S. military’s containerized materiel to determine exactly where the military is shipping it, Gen. Jacqueline Van Ovost, the commander of U.S. Transportation Command, told the Journal last year. We look to go to the berths that don’t have the ZPMC cranes"