The vital relation between a nation's security and its ability to protect and control its sea lines of communications (LOC's) was articulately set forth almost a century ago by Alfred Thayer Mahan.
Colbert, R. G.
"President's Notes: Challenge!,"
Naval War College Review: Vol. 24
, Article 2.
Available at: http://digital-commons.usnwc.edu/nwc-review/vol24/iss4/2