Harbor Defense Command

Harbor Defense Command was a military organization of the United States Coast Guard designated in 1925.

Harbor Defense Command areas

 * Boston Harbor
 * Fort Banks (Massachusetts)
 * Battery Kellogg
 * Battery Lincoln
 * Fort Heath (Massachusetts)
 * Battery Winthrop
 * Los Angeles Harbor
 * Fort MacArthur (California)
 * Battery John Barlow and Saxton (NRHP)
 * Battery Osgood-Farley (NRHP 8600032, LA H-CM #515)