USNS Red Cloud
USNS Watkins
Etc
https://www.theguardian.com/world/2008/jun/02/terrorism.terrorism
USNS
"Other ships that have been stationed at or near Diego Garcia in the Indian Ocean, which warrant investigation regarding possible secret detention facilities, are, according to Reprieve: USNS Watson, Watkins, Sister, Charlton, Pomeroy, Red Cloud, Soderman, and Dahl; MV PFC William B Baugh, Alex Bonnyman, Franklin J Phillips, Louis J Huage Jr, and James Anderson Jr"
Another USN sauce:
https://www.theatlantic.com/international/archive/2014/06/americas-floating-prisons/373577/
USCG
https://www.usatoday.com/story/news/world/2017/11/28/u-s-coast-guard-operating-secret-floating-prisons-pacific-ocean/900462001/