OK, let's try another angle here.
Where does your "security threat" come from? Sure, anything is possible. Watch 24 or a Harrison Ford movie.
Is it a teak paneled office 10,000 miles away? Or is it the docks and yards where things are loaded and unloaded? "Managed" here essentially means who is making the money off it.
There are ALREADY people who barely or don't speak English working in ports (and other places) for Domestic-American owned companies. Think about maintenance and cleaning sub-contractors. Truck drivers. Etc.
OK, just me being me - but if I wanted to infiltrate terrorist operatives into a port operation, the LAST company I'd use to do so would be an Arab one.