The submarine gained international attention during the NATO exercise JTFEX 01-2 in March 2001 in the Caribbean Sea. During the exercise, U-24 successfully penetrated the defensive screen of the U.S. nuclear aircraft carrierUSS) Enterprise), simulated a torpedo attack on the carrier, photographed it through the attack periscope, and then surfaced alongside the vessel while firing green flares to signal "torpedo fired."[4]#citenote-abendblatt-4)[[5]](https://en.wikipedia.org/wiki/German_submarine_U-24(S173)#cite_note-tonline-5) This demonstration highlighted the effectiveness of small, quiet diesel-electric submarines against even the most sophisticated surface combatants.
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