As the title says, I think the mission "Hostage Rescue Aboard Cargo Ship" in the Sharpshooter-Variation can currently not be cleared.
It requires 4 personnel with the new Sharpshooter training, which is a course at the Police Academy. But neither Patrol Boat nor Police Heli, nor any other police vehicle are able to actually reach Ocean Rescue Missions.
And of the stations that can reach Ocean Rescue Missions (Fire Boat Dock, Rescue Boat Dock, Coastal Rescue Station, Coastal Air Station and Medical Helicopter Station), their personnel can not be trained in or even hired for coins with Sharpshooter training.
Possible solutions would be to either add a Sharpshooter course to the Coastal Rescue School or to enable Police Helis and/or Patrol Boats to reach Ocean Rescue Missions