if you could travel in time only 1 time, where and when would you go?

[SBTNW]

a long time ago i read this book
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where the US army develope the time travel and choose to travel to Israel during the time of Jesus Christ. they also consider go to 1492 (Cristobal Colon and the America discover) and also go back to the US Civil War.

so, what would you choose?