USNS Persistent (T-AGOS-6) was a Stalwart-class Modified Tactical Auxiliary General Ocean Surveillance Ship of the United States Navy.
Stalwart-class ships were originally designed to collect underwater acoustical data in support of Cold War anti-submarine warfare operations in the 1980s. Ex-USNS Persistent is now T/S State of Michigan, owned by the U.S. Department of Transportation's Maritime Administration and assigned to the Great Lakes Maritime Academy, Traverse City, Michigan.
The Stalwart-class ocean surveillance ships were succeeded by the longer Victorious-class ocean surveillance ships. Persistent had an overall length of and a length of at its waterline. It had a beam of and a draft of . The surveillance ship had a displacement of at light load and at full load. It was powered by a diesel-electric system of four Caterpillar D-398 diesel-powered generators and two General Electric electric motors. This produced a total of that drove two shafts. It had a gross register tonnage of 1,584 and a deadweight tonnage of 786.
The Stalwart-class ocean surveillance ships had maximum speeds of . They were built to be fitted with the Surveillance Towed Array Sensor System (SURTASS) system. The ship had an endurance of thirty days. It had a range of and a speed of . Its complement was between thirty-two and forty-seven. Its hull design was similar to that of the Powhatan-class fleet ocean tugs.