Cats: 3.rar
Interestingly, in Australian military jargon, the term is a nickname for the 3 RAR (3rd Battalion, Royal Australian Regiment), as noted in the Australian English military slang glossary . If your query is related to military history or a specific unit report ("write-up"), it may be referencing this battalion.
Often, these files are password-protected. Common steps include: Checking the challenge description for clues. cats 3.rar
Used to browse through different color planes of an image to find hidden text or QR codes. Interestingly, in Australian military jargon, the term is