In the US, this is the Sea Scouts. Almost nobody knows about them, but anyplace near big water likely has several ships (same as a troop). It's a great program, we were involved when my son was a teenager - they (group of teenagers) literally ran a 100 ton, 95 foot former USCG Cutter. It's great for boys and girls, I'm convinced they get more training than the Navy does. :-)