US Navy's nuclear-powered submarine USS Michigan completes refit period.

According to information published by the U.S. DoD on May 27, 2022, USS Michigan (SSGN 727) recently completed an extended refit period at Puget Sound Naval Shipyard & Intermediate Maintenance Facility.
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Ohio-class submarine USS Michigan (Picture source: U.S. DoD)

USS Michigan (SSBN-727/SSGN-727) is an Ohio-class nuclear-powered guided-missile submarine (SSGN), converted from a ballistic missile submarine (SSBN), that is part of the United States Navy.

About Ohio-class submarines

The Ohio class of nuclear-powered submarines includes the United States Navy's 14 ballistic missile submarines (SSBNs) and its four cruise missile submarines (SSGNs). Each displacing 18,750 tons submerged, the Ohio-class boats are the largest submarines ever built for the U.S. Navy.

The class has a length of 560 m (170 m), a beam of 42 ft (13 m), and a draft of 35.5 ft (10.8 m). She can carry up a complement of 155 sailors (including 15 officers).

The class's design allows the boat to operate for about 15 years between major overhauls. These submarines are reported to be as quiet at their cruising speed of 20 knots (37 km/h; 23 mph) or more as the previous Lafayette-class submarines at 6 knots (11 km/h; 6.9 mph), although exact information remains classified. Fire control for their Mark 48 torpedoes is carried out by Mark 118 Mod 2 system, while the Missile Fire Control system is a Mark 98.