USS Sinuiji (NCC-1770) was a Constitution-class (Achernar-subclass) heavy cruiser on active duty in Starfleet during at least the late 23rd century. (Star Fleet Technical Manual) In 2285, during the Kelvan War, Sinuiji was assigned to Task Force Four and was one of the few vessels to survive until the arrival of Task Force Six. (Orion Press: In Harm's Way)