There are security forces aboard cruise ships. I know that Radisson uses Nepalese Gurkhas; I have heard that other cruise lines also use Gurkhas. Not only are there arms aboard; there is also a brig.
"The test of a first rate intelligence is the ability to hold two opposed ideas in the mind at the same time and still retain the ability to function."
F Scott Fitzgerald
Silversea Silver Explorer (23nts) - Kangerlussuaq, Greenland - Nome, Alaska - Aug 14
Seven Seas Voyager (30nts) - Dubai - Cape Town - Nov 14