A 2rar - Irina

: Comprising four specialized infantry platoons.

: Under its specialized 2018 structure, the battalion includes: Irina A 2rar

If "Irina A" refers to a specific individual or a more technical software feature (such as a specific RAR file attribute or a developer's nickname), could you please provide more context? : Comprising four specialized infantry platoons

The primary "proper feature" of the current 2 RAR structure is its role as the for the Australian Amphibious Force. This unique capability distinguishes it from other standard infantry battalions through several specialized units: Irina A 2rar