In April 2008, Chosin failed[4] her Board of Inspection and Survey (InSurv) examination and was judged "unfit for sustained combat operations."[5][6] In spring of 2008, Chosin had received replacement gun barrels for both of her 5-inch guns.[7]
On 6 November 2009, Chosin assumed the role as flagship for the counter-piracy task force Combined Task Force 151.[8] On 17 November 2009, Chosin rescued three stranded Yemeni fishermen in the Gulf of Aden. According to the fishermen, they were left stranded in the water after 12 suspected Somali pirates hijacked their vessel. The fishermen also said that the pirates gave them an ultimatum to either jump overboard with only a wooden plank as a flotation device or be killed. Chosin medical personnel treated the fishermen and gave them food and water. Once the fishermen were deemed to be medically stable, Chosin transferred the fishermen to a Yemen Navy vessel.[9]
In April 2013, Chosin passed its Board of Inspection and Survey (InSurv). On 30 April 2013, Chosin departed her home port of Joint Base Pearl Harbor–Hickam (JBPHH) for a scheduled Western Pacific deployment. While deployed, Chosin was scheduled to conduct theater security operations with partner nations while providing deterrence, promoting peace and security, preserving freedom of the seas and providing humanitarian assistance/disaster response.[10] In October 2013, the cruiser participated in the International Fleet Review 2013 in Sydney, Australia.[11]
In February 2014, Chosin dispatched supplies via helicopter to Royal Canadian Navy ship HMCS Protecteur after a severe engine room fire left her dead in the water about 630 km (390 mi) off the coast of Hawaii.[12] For providing assistance to Protecteur, the Canadian government awarded Chosin a Canadian Forces' Unit Commendation.[13]
In June 2016, Chosin's homeport was changed to San Diego.[14]
In October 2019 it was announced that Chosin would be shifting to Seattle, WA, to complete a depot-level modernization period at Vigor Marine's Harbor Island facility starting in December 2019.[15]Chosin arrived in Seattle in February, 2020.
In February 2023, Vigor completed modernization of Chosin and she returned to her homeport in San Diego.[16] The Navy is seeking to decommission the ship in FY2027.[17]
In October 2024 the Navy announced a successful test aboard Chosin of a Transferable Rearming Mechanism (TRAM) to reload a ship's vertical launch system while at sea rather than in a port.[18]
^"Participating Warships". International Fleet Review 2013 website. Royal Australian Navy. 2013. Archived from the original on 10 December 2013. Retrieved 14 December 2015.