If you are actually looking for information on an old file (a compressed archive), the term "1.rar" usually refers to a specific part of a split archive or a very early version of the format.

: The RAR format started with version 1.3/1.5 in the mid-90s, using proprietary compression algorithms.

The 1st Battalion has a deep history dating back to 1945, with posts often commemorating their major deployments and specialized roles.

: 1 RAR served famously in the Vietnam War, operating out of Bien Hoa Air Base and uncovering the Cu Chi tunnel complex during Operation Crimp.