A state's sealift capabilities may include civilian-operated ships that normally operate by contract, but which can be chartered or commandeered during times of military necessity to supplement government-owned naval fleets. Some smaller navies have built multi-role vessels that combine sealift with other capabilities, such as those of a patrol frigate or a command-and-control vessel. The Royal Danish Navy's Absalon-class and the Royal New Zealand Navy's multi-role vessel HMNZS Canterbury being two examples.