As the sergeant major of the Army, Grinston is the Army chief of staff's personal adviser on matters affecting the enlisted force. He devotes the majority of his time traveling throughout the Army to observe training and interact with Soldiers and their Families. He sits on a variety of councils and boards that make decisions affecting enlisted Soldiers and their Families and routinely invited to testify before Congress. Grinston is the public face of the U.S. Army's Noncommissioned Officer Corps, representing the NCO Corps to the American people in the media and through business and community engagements.