 During the lead-up to the 2018 Trump-Kim Summit, Home Affairs Minister K. Shanmugam revealed that four people had been turned away at the checkpoints for terrorism related reasons.ICA is part of the Inter-Agency Coordination Group within the Republic of Singapore Navy's Maritime Security Task Force.ICA participated in the 2011 Exercise Northstar, in which immigration officers boarded ships to check for immigration offenders, firearms and explosives.