US Navy lost rare MQ 4 Triton drone:
CNN reports the US Navy lost an MQ 4 Triton drone last Thursday after it crashed over the Persian Gulf.
It is one of the most advanced and unusual systems in the American military, with only 20 ever built.
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The report says it is worth about 240 million dollars, roughly twice the cost of an F 35.
The cause of the crash has not been released.
