If you harbored any illusions that the United States government is in any way competent at fighting terrorism, you might want to take a look at this Wikipedia page about the favorite watch of terrorists, the Casio F91W.
The Wikipedia list notes that possession of a Casio F91W by a detainee is repeatedly cited in Guantanamo Bay Combatant Status Review Tribunal reports and other government documents. For example, a Summary of Evidence Memo prepared about Abdullah Gulam Rasoul noted,
The detainee was captured with two casio watches of the model that has been used in bombings that have been linked to al Qaida and radical Islamic terrorist improvised explosive devices.
Similarly, in justifying the continued detention of Majid Aydha Muhammad Al Qurayshi, the U.S. government noted that,
The detainee is on a list of detainees with a Casio model F-91W watch. This model watch has been used in bombings that have been linked to al Qaida and radical Islamic terrorist improvised explosive devices.
Of course this might mean something if the F91W wasn’t a cheap watch that retails for about $7.50 in the developing world and is extremely common. I’m surprised the documents don’t cite possession of a Nokia 1100 cell phone while they’re at it.