Army Service Ribbon

When successfully completing a designated Noncommissioned Officer professional development course, the service member is awarded the Noncommissioned Officer's Professional Development Ribbon.
A numeral is attached to the ribbon to show completion of specific levels of subsequent courses. Primary level course is signified by the basic ribbon; basic level course with the number 2; advanced level course with number 3; and senior level course (Sergeants Major Academy) with number 4.
AR 600-8-22 lists the precise criteria for award of the Noncommissioned Officer's Professional Development Ribbon.