After World War I, the French built the Maginot Line, a series of defensive fortifications to guard against invasion by Germany or Italy. The French spent a lot of money building the Maginot Line, based upon their linear thinking of the battlefield and experience with World War I trench warfare. Ultimately, it is considered by many to be one of the great military mistakes of all time, since the Maginot Line made little difference in World War II and was fairly easily bypassed by the Germans, who conquered France by 1942. I bring up the Maginot Line to bring attention to a capability that our soldiers lack today — joint, networked communications.
http://www.armedforcesjournal.com/2009/06/4017546