Brig. Gen. Joseph M. Martin (left) hands an Assumption of Responsibility certificate to SGM Richard K. Johnson. SGM Johnson is the Combined Arms Center - Training's top non-commissioned officer. Brig. Gen. Martin is CAC-T's deputy commanding general. He said SGM Johnson will play a critical role in CAC-T's training support and training development missions. SGM Johnson said he looked forward to helping CAC-T advance Army readiness.