sentences:  Badges are designed and approved by the South African National Defence Force's heraldry section, and registered at the Bureau of Heraldry to provide legal protection against misuse.It is the custom in the United States Navy (USN) for ships, bases and other commands to receive an individually designed heraldic emblem.Due to heraldic traditions in the U.S., these emblems usually take the form of "seals" or "crests"; the terms are used often interchangeably, although the emblems are different.