With a snip of the scissors Oct. 25, Naval Submarine School (SubScol) welcomed the latest addition to its attack center trainer inventory, the Submarine Multi-Mission Team Trainer Phase (SMMTT) 3. SMMTT3 is a shore-based trainer for submarine combat control and sonar systems, and the latest version of attack centers to allow submarine crews to rehearse and execute tactical, at-sea missions, in a training environment. “SMMTT3 is a significant step forward in shore-based training," said Lt. Cmdr. Robert Haldeman, operations officer for SubScol’s Advanced Tactical Employment Training Department. Phase 3 of the Submarine Multi-Mission Team Trainer is the result of previous system evolution and technology improvements with a wide range of organizations partnering to make it a reality.