You’re in Command Boat Responsibly, a United States Coast Guard (USCG) slogan to encourage boaters to take personal responsibility for their vessel and those onboard.
Houseboat Propeller Regulation Proposed and Withdrawn by USCG: Analysis by PGIC
History of Boat Propeller Safety
Mitigating Boat Propeller Injuries & Fatalities Chart
Four Volume Review of the Boating Industry’s Boat Propeller Guard Product Liability Defense