 The four levels are lance-corporal (minimum age 14), corporal (minimum age 15), sergeant (minimum age 16), and staff sergeant (minimum age 17).Non-commissioned officers often play an important role in The Boys' Brigade, helping the officers and other adults with organising activities and awards classes, particular in the Anchor and Junior sections.Based on the rank insignia of the British Army at the time the Brigade was formed, non-commissioned officer to the rank of sergeant wear chevrons on their upper right arm, and staff sergeants wear four chevrons on the lower sleeve, pointing down.