What is the main function of an ASI in relation to a Soldier's MOS?

An additional skill identifier (ASI) serves as a designation that enhances a Soldier's primary military occupational specialty (MOS) by indicating specialized training or qualifications. This allows a Soldier to demonstrate proficiency in particular skills that are not inherently part of their primary MOS. Therefore, the ASI can open up opportunities for Soldiers to perform more specialized tasks or roles within their unit, which can be essential for mission success.

The ASI helps to clarify the unique abilities a Soldier possesses, ensuring that their specialized training is recognized and utilized effectively in their assignments. It indicates additional competencies that augment the Soldier's primary role, thus providing a clear advantage in terms of operational capability and career development.