Baseline 4
USS Chosin (CG 65)
USS Hue City (CG 66)
USS Shiloh (CG 67)
USS Anzio (CG 68)
USS Vicksburg (CG 69)
USS Lake Erie (CG 70)
USS Cape St. George (CG 71)
USS Vella Gulf (CG 72)
USS Port Royal (CG 73)

Baseline 4 integrates the AN/UYK-43/44 computers (in place of UYK-7 and UYK-20) with superset computer programs developed for the DDG 51. CG 65-73 have the improved UYS-20 data display system and various decision aids. All ships of the group had the SQS-53C sonar and the SQR-17 sonar data processor.