The Tjeld class were a class of fast patrol boats (FPB) designed in Norway. They were used as torpedo boats in Norway where this type of vessel were called MTBs or motor torpedo boats (motortorpedobåt). The class was also known as the Nasty class. The design was also sold to the USA, Greece and West Germany. Six vessels were built in the USA by John Trumpy and Sons [1] of Annapolis, Maryland (some parts, such as the keel and stem being imported). The US Navy used them as PTF boats in the Vietnam War.