If you want to stay near Sambawang wharfs here US Navy dock their ships, you better get yrself a Geiger counter.
Even though ASEAN has a nuclear non pleriferation policy, US has a no-ask, no-tell policy on their nuclear weapons movement.
And a few yrs ago a USN ship went from japan to sembawang without realising there was a radiation leak. It was only later japan realised the fact.