https://en.wikipedia.org/wiki/United_States_Navy_ships
https://www.military.com/equipment/national-security-cutter
https://en.wikipedia.org/wiki/Ironclad_warship#First_battles_between_ironclads:_the_U.S._Civil_War
https://en.wikipedia.org/wiki/History_of_the_United_States_Navy
https://www.history.uscg.mil/