‘Underground’ May Be the U.S. Military’s Next Warfighting Domain – Defense One

We must not allow a mineshaft gap?

Tunnels and subterranean infrastructure demand high-level attention, training, and technology, the military’s intelligence chief says.
— Read on www.defenseone.com/technology/2018/06/underground-may-be-us-militarys-next-warfighting-domain/149296/

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