First Sgt. Frank O. Robinson, Company A First Sergeant, Headquarters Battalion, sings cadence during a battalion run through the Combat Center, Jan. 15, 2016. (Official Marine Corps photo by Sgt. Charles Santamaria/Released) - First Sgt. Frank O. Robinson, Company A First Sergeant, Headquarters Battalion, sings cadence during a battalion run through the Combat Center, Jan. 15, 2016. (Official Marine Corps photo by Sgt. Charles Santamaria/Released)