Passing through the Strait of Malacca in late December, "Berkeley" and the "Enterprise" battle group sailed into the Indian Ocean and moored at Diego Garcia Island on 5 January 1990. Next, the group operated in the northern Arabian Sea and Persian Gulf—keeping an eye on the still-tense ceasefire between Iran and Iraq—until putting into Muscat, Oman, for a port visit on 20 January. Following exercises with the Sultan of Oman's Navy, "Berkeley" left the battle group on 1 February and headed back east. She participated in exercises with the Royal Thai Navy on 3 February and, after a five-day visit to Phuket, Thailand, steamed into Subic Bay on 18 February. From there, the warship continued toward home and arrived at San Diego on 15 March.