Where can you find your MOS Duty Description?

The correct answer is DA Pam 611-21 because this publication provides comprehensive information regarding Military Occupational Specialties (MOS), including detailed descriptions of duties and the tasks associated with each MOS. It is specifically designed to help soldiers understand their roles and responsibilities based on their assigned MOS, ensuring clarity and guidance for performance and expectations within the military structure.

The other choices encompass different documents that serve distinct purposes - AR 600-55 focuses on driver and operator standards in the military, SF 91 is a form used for motor vehicle accidents, and DA 750 pertains to a performance evaluation form. These documents do not contain detailed MOS duty descriptions as outlined in DA Pam 611-21, making it the most relevant choice for locating a MOS Duty Description.