Coming from the same guys that missed the Chechen terrorists the Russians were screaming at us to look out for.
In the last few years several tunnels from Tijuana to warehouses in San Diego have been discovered. God knows how many have not been discovered. The tunnels are equipped with rail tracks and lead to warehouses with truck loading docks. We don’t know what was loaded onto 18 wheel trucks and sent all over the USA. Do not believe that the border fence, which only covers a fraction of the border there in San Diego, has fixed the problem.
Since every agency in government has been politicized, I take the Admiral’s words with a grain of salt...