Sgt. Maj. Charles McDew, sergeant major, 3rd Battalion, 4th Marines, 7th Marine Regiment, assumed leadership of "Darkside" in January of 2016 and has served in the Marine Corps for more than 20 years. (Official Marine Corps photo by Cpl. Medina Ayala-Lo/ Released) - Sgt. Maj. Charles McDew, sergeant major, 3rd Battalion, 4th Marines, 7th Marine Regiment, assumed leadership of "Darkside" in January of 2016 and has served in the Marine Corps for more than 20 years. (Official Marine Corps photo by Cpl. Medina Ayala-Lo/ Released)