Puddle pirate

Puddle pirates is a derogatory term for a group who, professionally or voluntarily, is considered to play at being sailors or a navy. The term has been used as a synonym for:
 * US Coast Guard - in contrast with the US Navy
 * US Coast Guard Reserve and US Coast Guard Auxiliary - as reserves for the US Coast Guard
 * Sea Scouts - in contrast with merchant sailors
 * Youth Cadet Corps - as a junior version of the corresponding Navy