What year did AR 350-90 establish Army wide standards for NCO academies?

The year that AR 350-90 established Army-wide standards for NCO academies was 1957. This regulation aimed to standardize the training and professional development of Noncommissioned Officers by creating a uniform curriculum and structure for NCO academies across the Army. By implementing these standards, the Army sought to ensure that all NCOs received comprehensive training that aligned with the service's goals and requirements at the time. This enhancement in training standards was important for maintaining the quality of leadership within the ranks and contributing to the overall effectiveness of Army operations.