SINKEX

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ex-Towers (DDG-9) at the end of a SINKEX
ex-Towers (DDG-9) at the end of a SINKEX

SINKEX or Sink Exercise is a military test of a weapons system usually involving a torpedo or missile attack of an unmanned target.

The US Navy sometimes refers to this type of exercise as a HULKEX (Hulk + Exercise).