Rearranging the letters of 'The Guantanamo prison' gives:
O, that USA! Raping men, no?
(by Aronas Pinchas) (2009) (pending approval)
Other related anagrams without their own page:
"America's prisoners in Guantanamo bay" -> "Misery, as I am persona non grata in Cuba." (by Tony Crafter using Anagram Genius) (2006) (pending approval)
"Guantanamo Bay" -> "Gunman: "Ay, a boat!"" (by Mick Tully using Anagram Genius) (2009) (pending approval)
"Guantanamo Bay suspects" -> "A cast manage, but no pussy!" (by Mick Tully using Anagram Genius) (2008) (pending approval)
"Guantanamo Bay suspects" -> "A saga, but no pussy act, men!" (by Mick Tully using Anagram Genius) (2008) (pending approval)
"Guantanamo Bay suspects" -> "Gasp! USA sent many to Cuba." (by Mick Tully using Anagram Genius) (2008) (pending approval)
"Guantanamo Bay suspects" -> "Many a Gestapo stuns Cuba." (by Mick Tully using Anagram Genius) (2008) (pending approval)
"Detention" -> "Need it not!" (by Orita Allen using Anagram Genius) (2005)