While "jg.rar" may look like a computer file (specifically a WinRAR archive), it is most likely a shorthand reference to conducted by the Royal Australian Regiment (RAR) . The "Jungle RAR" Experience
The Royal Australian Regiment (RAR) is the senior infantry regiment of the Australian Army . Its members, often referred to as "Diggers," are widely considered world experts in tropical warfare due to their extensive history in Southeast Asia. jg.rar