It frequently appears in language learning resources, such as the Outcomes Advanced series by National Geographic Learning, where video files are bundled in .rar format for students and teachers.
It can be found in technical forums like All About Circuits , where users share compressed project files or video demonstrations of hardware setups.
To give you a better post or more specific information, could you clarify or what the content is supposed to be ? 50th Anniversary 3rd Battalion RAR Vietnam 1971